rear dual wheels

ilcag · Member

rear dual wheels

Yuglamron · Guru

I drive an A class Motor Home based on a MAN Truck/Bus chassis.

Duals on the back and in eight years mostly highway driving have had one blowout just the week before last Xmas. Having one tyre left on the axle I limped (Carefully and slowly of course) the 10 K's into Forbes to have a new tyre fitted.

Apart from that I have had no problems with the twin tyre setup. Obviously kept a lookout for rocks between the tyres and the normal pressure checks that is the only problem I have had.

With the tyre pressures I used to go into our local Bridgestone guys and get them to check pressures all round and I also used to softball bat to check when I stopped on trips.

Someone will come along and give you more info for sure.

Jaahn · Guru

Hi Ilcag smile

Where is the problem with duals ? confuse There must be a couple of trillion trucks in the world with duals, big ones and small ones, trailers and b doubles and even road trains in the outback. A tried and proven way to carry a bit of weight for a hundred years or so. biggrin

Not too many down sides. Perhaps a small learning curve for changing them on the road but not too hard really. If it has duals I guess it is really a heavy vehicle anyway and some training is in order before use !

Jaahn

Dwilz · Veteran Member

Jaahn wrote:
Hi Ilcag
Where is the problem with duals ? There must be a couple of trillion trucks in the world with duals, big ones and small ones, trailers and b doubles and even road trains in the outback. A tried and proven way to carry a bit of weight for a hundred years or so.
Not too many down sides. Perhaps a small learning curve for changing them on the road but not too hard really. If it has duals I guess it is really a heavy vehicle anyway and some training is in order before use !
Jaahn

Have to agree with this

Aus-Kiwi · Guru

I had a flat then blowout on my old Fuso 9m bus.. It was on wide corner too.. Didn't have any issues keeping control at 90-100 KPH.. Found out the tyres where over 20 years old and Jap 18" which we don't have in Aust for trucks.. New tyres and rims fixed !!___ The newer A class Explorer has 225 X 19.5 Michelins as fitted at factory.. The previous tyres have done just over 80,000 klrs.. Last two replaced due to age.. With duel tyres . The only thing is checking inside tyre pressures.. An extension valve helps reaching to apply air.. The other thing is if going through some rocky terrain ? Before going back on main highway is to check that no rocks have lodged between the rear tyres.. They can fly out at speed and hit vehicle etc..

-- Edited by Aus-Kiwi on Wednesday 8th of March 2017 10:33:57 PM

kezngaz · Senior Member

If you do have duels and use valve extentions, ask for the ones that dont hold oressure untill you depress the shreader valve in as these can be broken by stones on road resulting in a flat tyre.
Alternatively get tour self an extended guage to check inner pressure.
All up, duels can carry more weight than singles, so if not to close to max axle weight will carry weight more safely.
Kezngaz.

macka17 · Guru

Only one thing really to watch out for (Apart from rocks and bricks t'ween 'em)
Is letting pressures get low.
They'll rub together and over heat like you wouldn't believe.
You really HAVE to keep them up a bit.

Try walking round the rig with 4 drags on and triples.

Lots of tyres, then some.

-- Edited by macka17 on Thursday 9th of March 2017 10:49:20 PM

Santa · Guru

Dual rear axle = greater load carrying capacity, better stability and much better traction on wet grass etc. smile

Peter_n_Margaret · Guru

Santa wrote:
Dual rear axle = greater load carrying capacity, better stability and much better traction on wet grass etc.

If that were all true, all off road vehicles would use them and exactly the opposite is the case.

Dual wheels are typically selected to keep the tyre diameter low so that the tray on the truck is not so high.

Cheers,

Peter

Santa · Guru

Peter_n_Margaret wrote:
Santa wrote:
Dual rear axle = greater load carrying capacity, better stability and much better traction on wet grass etc.
If that were all true, all off road vehicles would use them and exactly the opposite is the case.
Dual wheels are typically selected to keep the tyre diameter low so that the tray on the truck is not so high.
Cheers,
Peter

OK! won't pursue it. confuse

Tony Bev · Guru

Speaking from only a little experience of driving two motor homes only, of more or less the same dimensions
Without getting into anything technical such as type/size/pressure of the tyres

Brother has a Ford with duel wheels

I have a Fiat with single wheels

The Ford has much more stability on the bends of the road, than the Fiat

Peter_n_Margaret · Guru

Unlikely to be related to single or dual wheels. Much more likely to be a result of the suspension which are probably quite different.

Cheers,
Peter

macka17 · Guru

Duals are under load carrying vehicles for several things.

LOAD CARRYING and traction to pull load on rear.
4-8-12 points of contact to road.
as well as height of tray. But primarily the load and traction.

Look at the size they have to go to in tyres on the single rear trucks
Just to carry the loads they do.

and height leads to sway.
Watch a concrete mixer with full drum on a roundabout or bend sometime.

Turning with the drum rotation, Scared the sh-t out of me on my first r-about.

They tried singles on them for site work in beginning.
but not many.