Mixing Grandtreks front and back
Submitted: Thursday, Jul 31, 2008 at 16:44
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Findanomad
Hi
I have read some good advice here about not mixing tyre sizes and the damage it can do to the diff.
I have new Grandtrek AT20 on the front (standard OEM on Prado) and want to put Grandtrek AT3 on the back and also the camper trailer.
As these are the same size 265x65x17 just different tread will it cause any problems?
Thanks
Reply By: George_M - Thursday, Jul 31, 2008 at 17:06
Thursday, Jul 31, 2008 at 17:06
The issue here relates to the variation in the rolling circumferences of the different tread types. Even minor variations can cause problems with your transfer box when you have your centre diff locked.
I personally wouldn't do it - apart from the possibility of minor variations in the circumferences of tyres with different tread pattern but the same size, you have to deal with issue of spare
wheels - do you carry one of each?
George_M
AnswerID:
318326
Follow Up By: Max - Sydney - Thursday, Jul 31, 2008 at 20:24
Thursday, Jul 31, 2008 at 20:24
Why not put the AT20s on the CT and CT3s all round on the car, including as George said, on the car's spares?
The trailer's spare does not matter so much unless you want to be able to put it on to the car in an emergency.
Max
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Reply By: Robin Miller - Thursday, Jul 31, 2008 at 20:50
Thursday, Jul 31, 2008 at 20:50
As George's said you end up with diffrent rolling diameters.
In practise most Prado's and full time 4wds effectively have this anyway because they adjust tyre pressures wrongly.
The simple solution is that when your car is ready to go , do a rough check on how far the rim is above the ground on a front tyre then on a back tyre with a ruler or whatever.
Then on the axle with the flattest looking tyres , pump them till they are roughly the same height as the tyres on the other axle.
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318372