Hi, I posted a question a short time ago about tyres for my 2020 D Max. Thanks all for your replies. I now have another question. My tyre size on the D max at present is 255-65R17. On getting prices on that size the tyres are a lot dearer. Most Tyre places say that it is best to go for a tyre size of 265-65R17 as they are a more popular size tyre and a lot cheaper than the 255 ones. When I asked was there any consequences in doing that the reply was " JUST THAT IT WAS ILLEGAL AND NOT ROADWORTHY". Should I go up to the 265 size I would need to buy 5 tyres of that size as my spare 255 one has never been used and if it was to be used I then would have 2 tyres on the front or back that were 2 different sizes until I was able to have a repair done on the damaged 265 tyre. Can I please have any feed back in regard to this and what other owners of a D max have done when they have had to renew their tyres. Cheers and many thanks once again. Jim
Hi, I posted a question a short time ago about tyres for my 2020 D Max. Thanks all for your replies. I now have another question. My tyre size on the D max at present is 255-65R17. On getting prices on that size the tyres are a lot dearer. Most Tyre places say that it is best to go for a tyre size of 265-65R17 as they are a more popular size tyre and a lot cheaper than the 255 ones. When I asked was there any consequences in doing that the reply was " JUST THAT IT WAS ILLEGAL AND NOT ROADWORTHY". Should I go up to the 265 size I would need to buy 5 tyres of that size as my spare 255 one has never been used and if it was to be used I then would have 2 tyres on the front or back that were 2 different sizes until I was able to have a repair done on the damaged 265 tyre. Can I please have any feed back in regard to this and what other owners of a D max have done when they have had to renew their tyres. Cheers and many thanks once again. Jim
To use 265-65R17 tyres you'll need to fit 8" rims. However, if you fit 16" rims to replace your 17" rims you can go to 285 size tyres. Might be worth considering? Cheers
Sorry, I also meant to mention that there was reference made in regard to whether the rims on the vehicle were ALLOY or STEEL. It was not revealed how that had an effect re, the tyre size also. If anyone can enlighten us on that issue as well it would be appreciated. Jim
I had an odd sized spare on a Nissan I once owned. Ass I had bought the car second hand I did not notice the tyer was slightly smaller than the 4 road tyer's until I had a puncture.
Being on a gravel road at the time and running in 4 wheel drive the car became virtually undriveable with the one smaller wheel trying to turn faster than the other three but unable to do so.
Just something to bear in mind if considering the smaller spare.
I found out after the reason the car had a smaller / Standard size spare wheel was the slightly larger tyer's fitted to the vehicle would not fit in the spare wheel holder.
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In life it is important to know when to stop arguing with people
and simply let them be wrong.
265 or 255 are they not just the width of the tyre, maybe I am wrong but if thats the case I can't see how that would effect the drive train of the vehicle, still the same side profile and rim diameter.
Maybe I've missed something, apologies if I have
Ian
THE first place to start is looking at the tyre placard on the vehicle. Usually on the door pillar. That will list the allowable tire sizes for the vehicle. Anything shown there should be a direct allowed replacement. Possibly more information is also in the handbook.
However if you check the axle loads front an rear that will give you the max load for the tires and if that is within the tires allowed load as shown on the side wall and the speed rating is suitable then you should be able to fit them on a suitable allowed rim for the size.
Jaahn
265 or 255 are they not just the width of the tyre, maybe I am wrong but if thats the case I can't see how that would effect the drive train of the vehicle, still the same side profile and rim diameter. Maybe I've missed something, apologies if I have Ian
All above is correct, but it is illegal to fit 265 tyres on 17x7" rims. Have to go to 8" rims. Cheers
For the original tyres 255-65-R17 vs 265-65-R17, the 65 represents the % tyre height of the tyre width. So 65% of 255 is less than 65% of 265, therefore the 255-65-R17 tyres have a smaller rolling diameter than 265-65-R17, even though they have the same wheel hub size. A larger rolling diameter will give more ground clearance and a nicer ride in rough terrain ie from the tyres having taller side walls. However the larger diameter tyres means higher overall gearing for the vehicle and differences to the speedometer reading. I understand that higher (taller) gearing may not suit one's vehicle, if towing is involved. The vehicle has do more work to get going and keep going with the bigger wheels. Larger wheels weigh more too, and than may be important if one is near to maximum weight ratings. If one is consider 16" rims, it would be necessary to check the vehicle's brakes etc have the clearance and have correct wheel hub offset.
-- Edited by watsea on Thursday 23rd of February 2023 09:40:38 AM
-- Edited by watsea on Thursday 23rd of February 2023 09:41:50 AM
Hi RR I had the same dilemma with my 2017 MUX with OEM 255/60/18 tyres on 7inch rims, because of the lack of tyre options I changed to Hilux 17 inch rims, which are 7.5 inch wide and I have 265/65/17 tyres fitted, plenty of tyres options at a cheaper price. Thinking of changing my caravan wheels to the same as they all have the same stud pattern ( just have to check the offset ) Plenty of information on the Isuzu Forum re tyres or anything else you need to know. Ian
265 or 255 are they not just the width of the tyre, maybe I am wrong but if thats the case I can't see how that would effect the drive train of the vehicle, still the same side profile and rim diameter. Maybe I've missed something, apologies if I have Ian
All above is correct, but it is illegal to fit 265 tyres on 17x7" rims. Have to go to 8" rims. Cheers
You are probably correct Yobarr about the rim sizing
I was more concerned about what seemed to me to be being missed or not understood about the 255-265 discussion
THE first place to start is looking at the tyre placard on the vehicle. Usually on the door pillar. That will list the allowable tire sizes for the vehicle. Anything shown there should be a direct allowed replacement. Possibly more information is also in the handbook. However if you check the axle loads front an rear that will give you the max load for the tires and if that is within the tires allowed load as shown on the side wall and the speed rating is suitable then you should be able to fit them on a suitable allowed rim for the size. Jaahn
Very good reply Jaahn, good clear information.
That is where I would start, look at your tyre placard and confirm it in the handbook for your particular car.
