Hi all, just seeking any info. on what users of Toyo Open Country At2 - size 265-65R17 on my 2020 Isuzu D Max use for both general all day use as well as what inflation is found to be best when towing. I have just fitted these in the last few days and the tyre place said 40psi all round for normal use and leave the front 40psi pressure in the front and then increase the rear to 44psi for towing. I would appreciate any one with the same tyres in the above size offer their knowledge as far as what has worked for them to get the best out of the tyres. I want to start on the right pressure so look forward to your replies. Not saying the tyre place was wrong but in many cases opinions differ from time to time.
Thanks for your input. Jim
Possum3 said
12:19 PM Mar 3, 2023
I would suggest that the Tyre Company information would generally be correct.
There are many situations where general advices may need to be modified;
1. Road surfaces -sand, gravel, bitumen.
2. GVM of your vehicle.
3. Tow ball weight (TBW) when towing.
4. Vehicle suspension - leaf sprung, coil, air bag.
5. Shock Absorbers.
6. Utilisation of Weight Distribution System.
7. GVM of Caravan/trailer.
8. Driving habits, including speed.
9. Driving in 2WD or 4WD mode.
10. Inflation gas - Air or Nitrogen.
11. Road noise - Tread pattern.
In short you need to pressurise tyres to suit your individual comfort level, wear and tyre tread.-
Bicyclecamper said
01:59 PM Mar 3, 2023
Same size virtually as what I used to run, 36- 38psi for unloaded travel, 40 for when carrying 1800kg van. I got 120k km's at that psi level average. I had 3 lots of them and all averaged that amount of km's Japanese version though. Get less then half for chinese version.
RAINBIRD ROVERS said
02:37 PM Mar 3, 2023
Sorry, I should have thought to include the van info. It is about 3 ton loaded and have around 300 ball weight . I have had it all checked by the Qld Dept of Transport traffic guys. They did the whole weigh process on the van weights and wheels , the D Max as well loaded and both hitched and unhitched. It was a free session where they had arranged with Caravan Qld and they did it for free at a showground. They then sent about 7 pages with all the specific details on the setup. I was well within all limits on the van & tow vehicle. It is nice to carry all that should we ever be pulled up as they do sometimes. They are very thorough when they do it. I use the heavy Hayman Reece Towing set up with Tow Bar & Weight Dist. Hitch. Have been very happy with the set up. It is a Option RV 20ft off road Distinction. The TOYO tyres are Japanese made.
-- Edited by RAINBIRD ROVERS on Friday 3rd of March 2023 02:38:18 PM
Xyz said
03:31 PM Mar 3, 2023
I would try, say front 40-43 and backs with that weight maybe 46-48 and see how that rides. If it seems a bit harsh, drop a couple of psi out.
I think some people complicate/worry about tyre pressuresa a tad too much. K.I.S.S.
Ian
Whenarewethere said
03:55 PM Mar 3, 2023
From a cold morning to a hot afternoon or the sun on one side of the car for an hour, you will be surprised how much tyre pressure changes. TPMS will show you the changes to 1psi.
Radar said
04:39 PM Mar 3, 2023
RAINBIRD ROVERS wrote:
Sorry, I should have thought to include the van info. It is about 3 ton loaded and have around 300 ball weight . I have had it all checked by the Qld Dept of Transport traffic guys. They did the whole weigh process on the van weights and wheels , the D Max as well loaded and both hitched and unhitched. It was a free session where they had arranged with Caravan Qld and they did it for free at a showground. They then sent about 7 pages with all the specific details on the setup. I was well within all limits on the van & tow vehicle. It is nice to carry all that should we ever be pulled up as they do sometimes. They are very thorough when they do it. I use the heavy Hayman Reece Towing set up with Tow Bar & Weight Dist. Hitch. Have been very happy with the set up. It is a Option RV 20ft off road Distinction. The TOYO tyres are Japanese made.
Would you like to share that written information.
Your D Max would be the best one around getting those weights legally.
Onedodger said
11:34 AM Mar 4, 2023
Just as a note, Most Toyo open country Tyres are 10ply so are a little stronger than the usual 8 ply.
jadatis said
09:17 PM Mar 6, 2023
I make you a pressure/axleloadcapacity list for your tire, with build in maximum reserve, and still acceptable comfort and gripp.
Then you " ONLY" have to search back your acurately determined axleload for the situation back in that list for the needed cold filled pressure. The most tricky part in it all, and your responcibility.
But need more info of tyres for that
From tires nex from sidewall.
1. Maximum load or loadindex
2. Kind of tyre to determine the reference-pressure.
3. Speedcode, less important, have my own better system for that.
Then also if you want it in KG or lbs, and bar, kPa or psi.
If you also give max permissable axleweights and MP vehicle weight, I put them behind the needed presdure in the list.
Registered to this forum for tyrepressure information.
Aus-Kiwi said
11:41 PM Mar 6, 2023
I would start at 40lb . Take it for a drive . Check tyre temps . Then add another 5lb . If its cooler ? Chances are your about right ? As temps increase with lower pressures . Dont exceed max tyre pressures !!
G&S Chassis website has a good tyre pressure calculator in the menu at the bottom of the home page.
Using the detail of actual load on the wheels/tyres, the manufacturers load rating, and tyre maximum pressure, it will work out the guide pressure for you.
I have used it for the past 8 years, and during that time have had no issues with Cruiser or 2 different vans and the tyres. This has included running on highway, dirt roads and the Birdsville (badly cut up and covered in gibberish after the races) and Strzelecki Tracks(admittedly like a sealed road apart from 50kms of cut up).
This is relevant for yourself as I run Toyo Open Country tyres on the van and until last change over, the Cruiser. I will be going back on the Cruiser next set I purchase.
Perhaps look at it and do the calculation to get a formulated start point, and then see if you need to adjust to your liking after running for a while.
Cuppa said
10:00 AM Mar 7, 2023
I now (after 2 sets of Bridgestone D697's) run Toyo Open Country tyres on our Patrol. They are a slightly different size to. 265/75R16. They are also RT's because at time of purchase there were no AT's available.
We have an upgraded GVM of 3.9t & run close to that most of the time.
With the Tvan in tow the combined weight is around 5 tonne
With much of the weight currently removed (whilst caretaking long term) I run 30psi front & 36psi rear.
At our normal heavier weight I run 36/38 front & 44 rear
These are cold 'sealed road' pressures.
I roughly adhere to the 6psi rule for LT tyres - aim for a 6psi increase once tyres are warmed up (4psi is for non LT tyres).
Guess work is required as hot weather can have a significant impact.
These are similar pressures to what I ran in the Bridgestones, but without quite as much sidewall bulge as the Bridgestones had at those pressures (& the reason for changing). Even with off road pressures a lot lower for sometimes months at a time the Bridgestones wore evenly & gave what I thought was a good mileage for what were lower cost tyres (than the Toyo's). If I get 80k + from the Toyo's I'll be happy.
yobarr said
03:07 PM Mar 7, 2023
Cuppa wrote:
I now (after 2 sets of Bridgestone D697's) run Toyo Open Country tyres on our Patrol. They are a slightly different size to. 265/75R16. They are also RT's because at time of purchase there were no AT's available.
We have an upgraded GVM of 3.9t & run close to that most of the time. With the Tvan in tow the combined weight is around 5 tonne
With much of the weight currently removed (whilst caretaking long term) I run 30psi front & 36psi rear. At our normal heavier weight I run 36/38 front & 44 rear. These are cold 'sealed road' pressures. 75R 16
Gee Cuppa, the rear wheel tyre pressure seems very low for 3900kg GVM. My GVM is 3760kg but in order to accomodate towing 3500kg ATM van I run the car at 3650kg. With this I have 1350kg on the car's front axle, at 36psi, while rear has 2300kg and close to 60psi. For a while I ran 52psi on the rear but car moved around too much on the tyres, so back to 60psi.
My tyres are Maxxis AT 265/ 75R16 after I decided that the Mickey Thompsons I had were not value for money.
Tried Bridgestone D697s, but was not impressed, while BFG now are living entirely on their reputation, and nowhere near as good as they once were.
There are a million opinions on tyres, but I suggest that 44psi on the rear of a 3900kg car is too low. Cheers
miroku12g said
05:29 PM Mar 7, 2023
Surly it would not matter what the tyre brand is ? at then end of the day its the air that carries the weight, the tyre is just a vessel to hold the air.
Miroku12g
yobarr said
07:00 PM Mar 7, 2023
miroku12g wrote:
Surly it would not matter what the tyre brand is ? at then end of the day its the air that carries the weight, the tyre is just a vessel to hold the air.
Miroku12g
Different brands have different construction characteristics, but with 2300kg on them my Maxxis don't lose their 'bulge' until I get up to about 55psi.
There is no doubt that it is the air that carries the weight, but the same air pressure in different tyres will give different 'shapes'. Cheers
miroku12g said
10:01 AM Mar 8, 2023
Hi Yobarr,
Not whishing to cause any arguments, but not sure what you mean by "Bulge" & different "Shapes" agree that tyre manufactures have slightly different pressures, but fundamentally the radial tyres all work with the same principle, so, your Losing the "Bulge" in your Maxxis [Great tyre by the way] would indicate over inflation, hence, shortening tyre life, greater rolling resistance, given higher fuel use.
Every radial tyre needs to "bag" [hate that wording in a tyre] so lets use flexing instead, it's as you will know a radial tyre needs to deflect out of the sidewalls the same amount of hot air as it gets from friction on the road, either under or over inflation will not allow equal increase to deflection of air.
matter of interest: a tyre under inflated by 1.5 BAR [ approx 22PSI] will increase fuel consumption by 1%,
Anyway, good to have a conversation without the normal Bickering around here, even if it does mean that we agree to dis-agree.
Cheers
Dave
yobarr said
10:15 AM Mar 8, 2023
miroku12g wrote:
Hi Yobarr, Not whishing to cause any arguments, but not sure what you mean by "Bulge" & different "Shapes" agree that tyre manufactures have slightly different pressures, but fundamentally the radial tyres all work with the same principle, so, your Losing the "Bulge" in your Maxxis [Great tyre by the way] would indicate over inflation, hence, shortening tyre life, greater rolling resistance, given higher fuel use. Every radial tyre needs to "bag" [hate that wording in a tyre] so lets use flexing instead, it's as you will know a radial tyre needs to deflect out of the sidewalls the same amount of hot air as it gets from friction on the road, either under or over inflation will not allow equal increase to deflection of air. matter of interest: a tyre under inflated by 1.5 BAR [ approx 22PSI] will increase fuel consumption by 1%, Anyway, good to have a conversation without the normal Bickering around here, even if it does mean that we agree to dis-agree.
Cheers Dave
Thanks for the reply Dave. Your thoughts are acknowledged, and make sense, but I have found that the rear of the car moves around a bit if I run only 52psi on that axle, which carries 2300kg. At 60psi all is good as I am happy to sacrifice a bit of tyre life for a car that never moves sideways in strong side winds, or even when being overtaken by Triple or Quad Roadtrains in WA.
It us reassuring to note that you say Maxxis is a "Great tyre,by the way" as that brand was fitted only after the tyre shop I use in Kalgoorlie was unable to immediately supply the Toyos Open Country tyres that I wanted to try. Cheers
Whenarewethere said
10:46 AM Mar 8, 2023
Back in the late 1980s occasionally I had to drive a Rodeo 1 tonne vehicle with tray. Even with only up to 500kg on the tray as forward as possible. It wandered all over the road. 25kph was its borderline safe speed. An evil design at best.
I once had a tonne of blue metal in my Peugeot 504 boot, the only issue is it felt a touch under powered up hill.
Cuppa said
11:34 AM Mar 8, 2023
yobarr wrote:
Cuppa wrote:
I now (after 2 sets of Bridgestone D697's) run Toyo Open Country tyres on our Patrol. They are a slightly different size to. 265/75R16. They are also RT's because at time of purchase there were no AT's available.
We have an upgraded GVM of 3.9t & run close to that most of the time. With the Tvan in tow the combined weight is around 5 tonne
With much of the weight currently removed (whilst caretaking long term) I run 30psi front & 36psi rear. At our normal heavier weight I run 36/38 front & 44 rear. These are cold 'sealed road' pressures. 75R 16
Gee Cuppa, the rear wheel tyre pressure seems very low for 3900kg GVM. My GVM is 3760kg but in order to accomodate towing 3500kg ATM van I run the car at 3650kg. With this I have 1350kg on the car's front axle, at 36psi, while rear has 2300kg and close to 60psi. For a while I ran 52psi on the rear but car moved around too much on the tyres, so back to 60psi.
My tyres are Maxxis AT 265/ 75R16 after I decided that the Mickey Thompsons I had were not value for money.
Tried Bridgestone D697s, but was not impressed, while BFG now are living entirely on their reputation, and nowhere near as good as they once were.
There are a million opinions on tyres, but I suggest that 44psi on the rear of a 3900kg car is too low. Cheers
I ran similar pressures with the D697's & rotated them every 10,000kms & changed them at around 62,000kms which for D697's which had at least 50% of that mileage on rough & often rocky dirt roads at lower pressures, including Western Qld quartz roads. They would rise to 51 & 42 when warmed up according to my TPMS. At home on good roads I would have got another 10,000kms out of them, but put new ones on for remote & rocky Kimberley driving. I thought this quite a reasonable mileage for those tyres & conditions. I hope to get more with the Toyos. Only reason I changed from the Bridgestones was I found I was needing to run higher pressures than I wanted to in off-road rocky conditions because the thinner D697 sidewalls bulged too much making them more vulnerable to damage. I had always been a bit concerned about that, and after losing a 10 day old tyre to a 3' gash in a sidewall at very moderate speed, a hidden rock on a sandy stretch coming out of Mornington Wilderness camp about 60kms off the Gibb River Road, I decided to try tyres with a thicker sidewall & less bulge at the pressures I wanted to use next time around. Not a small decision when running 9 tyres . 4+2 spares on the car & 2+1spare on the Tvan. - all the same. (Yes I know 3 spares is overkill, & that 10 day old tyre was the only puncture I've ever had. If I were leaving home today I'd only carry two spares, but it's around 5 years since we were last there..... besides having too many spares is great 'insurance' against getting punctures! ).
When I first got the car (from Telstra) , with it's standard 3,400kg gvm it was fitted with 235's on split rims. I had to run those at their maximum pressure (60 or 65 psi IIRC) & felt like they were a blowout waiting to happen, especially on the 20kms of mountain dirt road to where we lived. Fitting the wider 265's was about being able to run lower pressures as much as it was about ditching the split rims. That was back in 2013 just after the gvm upgrade.
Magnarc said
01:46 PM Mar 8, 2023
yobarr wrote:
miroku12g wrote:
Hi Yobarr, Not whishing to cause any arguments, but not sure what you mean by "Bulge" & different "Shapes" agree that tyre manufactures have slightly different pressures, but fundamentally the radial tyres all work with the same principle, so, your Losing the "Bulge" in your Maxxis [Great tyre by the way] would indicate over inflation, hence, shortening tyre life, greater rolling resistance, given higher fuel use. Every radial tyre needs to "bag" [hate that wording in a tyre] so lets use flexing instead, it's as you will know a radial tyre needs to deflect out of the sidewalls the same amount of hot air as it gets from friction on the road, either under or over inflation will not allow equal increase to deflection of air. matter of interest: a tyre under inflated by 1.5 BAR [ approx 22PSI] will increase fuel consumption by 1%, Anyway, good to have a conversation without the normal Bickering around here, even if it does mean that we agree to dis-agree.
Cheers Dave
Thanks for the reply Dave. Your thoughts are acknowledged, and make sense, but I have found that the rear of the car moves around a bit if I run only 52psi on that axle, which carries 2300kg. At 60psi all is good as I am happy to sacrifice a bit of tyre life for a car that never moves sideways in strong side winds, or even when being overtaken by Triple or Quad Roadtrains in WA.
It us reassuring to note that you say Maxxis is a "Great tyre,by the way" as that brand was fitted only after the tyre shop I use in Kalgoorlie was unable to immediately supply the Toyos Open Country tyres that I wanted to try. Cheers
Two's up on the Maxxis Chris. I have them on the Paj very happy with them on and off road.
yobarr said
07:51 AM Mar 9, 2023
yobarr wrote:
Cuppa wrote:
I now (after 2 sets of Bridgestone D697's) run Toyo Open Country tyres on our Patrol. They are a slightly different size to. 265/75R16. They are also RT's because at time of purchase there were no AT's available.
We have an upgraded GVM of 3.9t & run close to that most of the time. With the Tvan in tow the combined weight is around 5 tonne
With much of the weight currently removed (whilst caretaking long term) I run 30psi front & 36psi rear. At our normal heavier weight I run 36/38 front & 44 rear. These are cold 'sealed road' pressures. 75R 16
Gee Cuppa, the rear wheel tyre pressure seems very low for 3900kg GVM. My GVM is 3760kg but in order to accomodate towing 3500kg ATM van I run the car at 3650kg. With this I have 1350kg on the car's front axle, at 36psi, while rear has 2300kg and close to 60psi. For a while I ran 52psi on the rear but car moved around too much on the tyres, so back to 60psi.
My tyres are Maxxis AT 265/ 75R16 after I decided that the Mickey Thompsons I had were not value for money.
Tried Bridgestone D697s, but was not impressed, while BFG now are living entirely on their reputation, and nowhere near as good as they once were.
There are a million opinions on tyres, but I suggest that 44psi on the rear of a 3900kg car is too low. Cheers
Seems that our forum is widely read as I was recently contacted by a person who is a member of another forum.
Apparently some self-appointed know-it-all had read my post above, and was happily announcing to the world that my pressures were way too high, and that maximum pressure for those tyres should be 36psi.
To help this fella, who no doubt will return to read our forum, I have posted a couple of photos from the sidewalls of my tyres, clearly showing that they're rated to carry 1550kg each and maximum pressure is 80psi. Cheers
-- Edited by yobarr on Thursday 9th of March 2023 07:54:22 AM
No names were mentioned, and no it was not me, but get off your high horse and don't stress over it, really!!.
Pesonally, I would never run those pressures my self(60psi), but, hey its a personal choice.
Ian
Bill B said
05:34 PM Mar 9, 2023
Bet it was Gordo1 who contacted you
yobarr said
05:37 PM Mar 9, 2023
Xyz wrote:
No names were mentioned, and no it was not me, but get off your high horse and don't stress over it, really!!. Pesonally, I would never run those pressures my self(60psi), but, hey its a personal choice. Ian
Hmmm. Bit difficult to understand how pointing out the indesputable facts regarding my tyre specifications causes me to be classed as the rider of a "High Horse". Perhaps you could explain your "reasoning" as I fail to understand how you, or anybody else, can attest that carrying 1150kg at 60psi in a tyre rated to carry 1550kg at 80psi is unacceptable. And although you're a "newbie" you might like to know that I don't "stress" over simply pointing out what is obvious to many. Cheers
Xyz said
05:50 PM Mar 9, 2023
No problems Tonto
Aus-Kiwi said
12:06 AM Mar 10, 2023
Its when the air goes to the top of the tyre ! Better to be a few lb over than under !! Besides to a point due to deflection the tyres warm up . Increasing pressure . Doesnt happen on same scale with nitrogen filled tyres .
Brenda and Alan said
08:24 AM Mar 10, 2023
Aus-Kiwi wrote:
Its when the air goes to the top of the tyre ! Better to be a few lb over than under !! Besides to a point due to deflection the tyres warm up . Increasing pressure . Doesnt happen on same scale with nitrogen filled tyres .
Doesn't matter what gas is in the tyre , a rise in temperature will lead to the same increase in pressure.
PV=nRT P pressure. V volume, n amount of gas, R ideal gas constant, and T temperature.
Alan
kgarnett said
09:40 AM Mar 10, 2023
In general when connecting a trailer the towball weight added at the rear of the towing vehicle will lighten the load on the front wheels and increase the load on the rear.
Consequently it is advisable the leave the front tyres at the non towing pressures (or even slightly decrease because of the decreased load at the front) and increase the rear tyre pressures as appropriate for the increased load at the rear.
On my LC200 with Toyo Open Country tyres, I run the front tyres at 33PSI and the rear at 44 PSI when towing my 3300kg van.
Hi all, just seeking any info. on what users of Toyo Open Country At2 - size 265-65R17 on my 2020 Isuzu D Max use for both general all day use as well as what inflation is found to be best when towing. I have just fitted these in the last few days and the tyre place said 40psi all round for normal use and leave the front 40psi pressure in the front and then increase the rear to 44psi for towing. I would appreciate any one with the same tyres in the above size offer their knowledge as far as what has worked for them to get the best out of the tyres. I want to start on the right pressure so look forward to your replies. Not saying the tyre place was wrong but in many cases opinions differ from time to time.
Thanks for your input. Jim
There are many situations where general advices may need to be modified;
1. Road surfaces -sand, gravel, bitumen.
2. GVM of your vehicle.
3. Tow ball weight (TBW) when towing.
4. Vehicle suspension - leaf sprung, coil, air bag.
5. Shock Absorbers.
6. Utilisation of Weight Distribution System.
7. GVM of Caravan/trailer.
8. Driving habits, including speed.
9. Driving in 2WD or 4WD mode.
10. Inflation gas - Air or Nitrogen.
11. Road noise - Tread pattern.
In short you need to pressurise tyres to suit your individual comfort level, wear and tyre tread.-
Sorry, I should have thought to include the van info. It is about 3 ton loaded and have around 300 ball weight . I have had it all checked by the Qld Dept of Transport traffic guys. They did the whole weigh process on the van weights and wheels , the D Max as well loaded and both hitched and unhitched. It was a free session where they had arranged with Caravan Qld and they did it for free at a showground. They then sent about 7 pages with all the specific details on the setup. I was well within all limits on the van & tow vehicle. It is nice to carry all that should we ever be pulled up as they do sometimes. They are very thorough when they do it. I use the heavy Hayman Reece Towing set up with Tow Bar & Weight Dist. Hitch. Have been very happy with the set up. It is a Option RV 20ft off road Distinction. The TOYO tyres are Japanese made.
-- Edited by RAINBIRD ROVERS on Friday 3rd of March 2023 02:38:18 PM
I think some people complicate/worry about tyre pressuresa a tad too much. K.I.S.S.
Ian
From a cold morning to a hot afternoon or the sun on one side of the car for an hour, you will be surprised how much tyre pressure changes. TPMS will show you the changes to 1psi.
Would you like to share that written information.
Your D Max would be the best one around getting those weights legally.
Just as a note, Most Toyo open country Tyres are 10ply so are a little stronger than the usual 8 ply.
One of many such free documents on their website www.caravancouncil.com.au/technical-articles
I run at 32psi. Sydney yesterday in warm weather at 40°C tyres were 36psi.
Using the detail of actual load on the wheels/tyres, the manufacturers load rating, and tyre maximum pressure, it will work out the guide pressure for you.
I have used it for the past 8 years, and during that time have had no issues with Cruiser or 2 different vans and the tyres. This has included running on highway, dirt roads and the Birdsville (badly cut up and covered in gibberish after the races) and Strzelecki Tracks(admittedly like a sealed road apart from 50kms of cut up).
This is relevant for yourself as I run Toyo Open Country tyres on the van and until last change over, the Cruiser. I will be going back on the Cruiser next set I purchase.
Perhaps look at it and do the calculation to get a formulated start point, and then see if you need to adjust to your liking after running for a while.
We have an upgraded GVM of 3.9t & run close to that most of the time.
With the Tvan in tow the combined weight is around 5 tonne
With much of the weight currently removed (whilst caretaking long term) I run 30psi front & 36psi rear.
At our normal heavier weight I run 36/38 front & 44 rear
These are cold 'sealed road' pressures.
I roughly adhere to the 6psi rule for LT tyres - aim for a 6psi increase once tyres are warmed up (4psi is for non LT tyres).
Guess work is required as hot weather can have a significant impact.
These are similar pressures to what I ran in the Bridgestones, but without quite as much sidewall bulge as the Bridgestones had at those pressures (& the reason for changing). Even with off road pressures a lot lower for sometimes months at a time the Bridgestones wore evenly & gave what I thought was a good mileage for what were lower cost tyres (than the Toyo's). If I get 80k + from the Toyo's I'll be happy.
Gee Cuppa, the rear wheel tyre pressure seems very low for 3900kg GVM. My GVM is 3760kg but in order to accomodate towing 3500kg ATM van I run the car at 3650kg. With this I have 1350kg on the car's front axle, at 36psi, while rear has 2300kg and close to 60psi. For a while I ran 52psi on the rear but car moved around too much on the tyres, so back to 60psi.
My tyres are Maxxis AT 265/ 75R16 after I decided that the Mickey Thompsons I had were not value for money.
Tried Bridgestone D697s, but was not impressed, while BFG now are living entirely on their reputation, and nowhere near as good as they once were.
There are a million opinions on tyres, but I suggest that 44psi on the rear of a 3900kg car is too low. Cheers
Miroku12g
Different brands have different construction characteristics, but with 2300kg on them my Maxxis don't lose their 'bulge' until I get up to about 55psi.
There is no doubt that it is the air that carries the weight, but the same air pressure in different tyres will give different 'shapes'. Cheers
Not whishing to cause any arguments, but not sure what you mean by "Bulge" & different "Shapes" agree that tyre manufactures have slightly different pressures, but fundamentally the radial tyres all work with the same principle, so, your Losing the "Bulge" in your Maxxis [Great tyre by the way] would indicate over inflation, hence, shortening tyre life, greater rolling resistance, given higher fuel use.
Every radial tyre needs to "bag" [hate that wording in a tyre] so lets use flexing instead, it's as you will know a radial tyre needs to deflect out of the sidewalls the same amount of hot air as it gets from friction on the road, either under or over inflation will not allow equal increase to deflection of air.
matter of interest: a tyre under inflated by 1.5 BAR [ approx 22PSI] will increase fuel consumption by 1%,
Anyway, good to have a conversation without the normal Bickering around here, even if it does mean that we agree to dis-agree.
Cheers
Dave
Thanks for the reply Dave. Your thoughts are acknowledged, and make sense, but I have found that the rear of the car moves around a bit if I run only 52psi on that axle, which carries 2300kg. At 60psi all is good as I am happy to sacrifice a bit of tyre life for a car that never moves sideways in strong side winds, or even when being overtaken by Triple or Quad Roadtrains in WA.
It us reassuring to note that you say Maxxis is a "Great tyre,by the way" as that brand was fitted only after the tyre shop I use in Kalgoorlie was unable to immediately supply the Toyos Open Country tyres that I wanted to try. Cheers
Back in the late 1980s occasionally I had to drive a Rodeo 1 tonne vehicle with tray. Even with only up to 500kg on the tray as forward as possible. It wandered all over the road. 25kph was its borderline safe speed. An evil design at best.
I once had a tonne of blue metal in my Peugeot 504 boot, the only issue is it felt a touch under powered up hill.
I ran similar pressures with the D697's & rotated them every 10,000kms & changed them at around 62,000kms which for D697's which had at least 50% of that mileage on rough & often rocky dirt roads at lower pressures, including Western Qld quartz roads. They would rise to 51 & 42 when warmed up according to my TPMS. At home on good roads I would have got another 10,000kms out of them, but put new ones on for remote & rocky Kimberley driving. I thought this quite a reasonable mileage for those tyres & conditions. I hope to get more with the Toyos. Only reason I changed from the Bridgestones was I found I was needing to run higher pressures than I wanted to in off-road rocky conditions because the thinner D697 sidewalls bulged too much making them more vulnerable to damage. I had always been a bit concerned about that, and after losing a 10 day old tyre to a 3' gash in a sidewall at very moderate speed, a hidden rock on a sandy stretch coming out of Mornington Wilderness camp about 60kms off the Gibb River Road, I decided to try tyres with a thicker sidewall & less bulge at the pressures I wanted to use next time around. Not a small decision when running 9 tyres . 4+2 spares on the car & 2+1spare on the Tvan. - all the same. (Yes I know 3 spares is overkill, & that 10 day old tyre was the only puncture I've ever had. If I were leaving home today I'd only carry two spares, but it's around 5 years since we were last there..... besides having too many spares is great 'insurance' against getting punctures!
).
When I first got the car (from Telstra) , with it's standard 3,400kg gvm it was fitted with 235's on split rims. I had to run those at their maximum pressure (60 or 65 psi IIRC) & felt like they were a blowout waiting to happen, especially on the 20kms of mountain dirt road to where we lived. Fitting the wider 265's was about being able to run lower pressures as much as it was about ditching the split rims. That was back in 2013 just after the gvm upgrade.
Two's up on the Maxxis Chris. I have them on the Paj very happy with them on and off road.
Seems that our forum is widely read as I was recently contacted by a person who is a member of another forum.
Apparently some self-appointed know-it-all had read my post above, and was happily announcing to the world that my pressures were way too high, and that maximum pressure for those tyres should be 36psi.
To help this fella, who no doubt will return to read our forum, I have posted a couple of photos from the sidewalls of my tyres, clearly showing that they're rated to carry 1550kg each and maximum pressure is 80psi. Cheers
-- Edited by yobarr on Thursday 9th of March 2023 07:54:22 AM
Pesonally, I would never run those pressures my self(60psi), but, hey its a personal choice.
Ian
Bet it was Gordo1 who contacted you
Hmmm. Bit difficult to understand how pointing out the indesputable facts regarding my tyre specifications causes me to be classed as the rider of a "High Horse". Perhaps you could explain your "reasoning" as I fail to understand how you, or anybody else, can attest that carrying 1150kg at 60psi in a tyre rated to carry 1550kg at 80psi is unacceptable. And although you're a "newbie" you might like to know that I don't "stress" over simply pointing out what is obvious to many. Cheers
Doesn't matter what gas is in the tyre , a rise in temperature will lead to the same increase in pressure.
PV=nRT P pressure. V volume, n amount of gas, R ideal gas constant, and T temperature.
Alan
Consequently it is advisable the leave the front tyres at the non towing pressures (or even slightly decrease because of the decreased load at the front) and increase the rear tyre pressures as appropriate for the increased load at the rear.
On my LC200 with Toyo Open Country tyres, I run the front tyres at 33PSI and the rear at 44 PSI when towing my 3300kg van.