I'm running 35in tyres but I can only fit a 33in spare on the back at the moment. I'm guessing its not great for the car to run uneven tyres but how far can you go before it causes real problems?
Some people have said not to run it on the back as it will screw the diff but then plenty of modern cars have a smaller diameter spare. Obviously running in 4wd would be asking for trouble!!!
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Damage from running smaller spare?
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Damage from running smaller spare?
73 Series Middy Cruiser 308 VN V8 OME 2in Susp lift 2in Body lift 35in Pro Comp X-Terrains
If you are on the soft stuff I dont hink it wont really be a issue.
On the road thou I would swap it with a front tyre and unlock the hubs.
On most road cars that have smaller spares they are speed limited when using the spare. Personally I wouldn't be too bothered about it, but would also get teh prignal fix asap.
On the road thou I would swap it with a front tyre and unlock the hubs.
On most road cars that have smaller spares they are speed limited when using the spare. Personally I wouldn't be too bothered about it, but would also get teh prignal fix asap.
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I've had to do it a couple of times unfortunately. I've encountered no problems. Longest stretch was Toolangi to Moorabbin (about 150kms).
Run em on the front in 2wd with hubs unlocked. I put about 50psi in spare Sumitomo 33x12.5R15 and about 18psi in Simex 35x11.5R15. Feels a bit strange, but take it easy and no probs.
Run em on the front in 2wd with hubs unlocked. I put about 50psi in spare Sumitomo 33x12.5R15 and about 18psi in Simex 35x11.5R15. Feels a bit strange, but take it easy and no probs.
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wouldn't be a problem providing you dont use 4wd, at all. if you have a lsd rear diff i would change the smaller 33" tyre to the front and leave it at that. it will destroy your lsd if you have one. it will consistently be slippingGQ Bear wrote:I've had to do it a couple of times unfortunately. I've encountered no problems. Longest stretch was Toolangi to Moorabbin (about 150kms).
Run em on the front in 2wd with hubs unlocked. I put about 50psi in spare Sumitomo 33x12.5R15 and about 18psi in Simex 35x11.5R15. Feels a bit strange, but take it easy and no probs.
i think if you tried to run it on the rear with a locker you would break an axle or something in no time.
Just swap a fullsize from the front to the rear, and put the smaller one on the front, with hubs unlocked in two wheel drive only.
Dont put 2 different sizes on the rear, or lock hubs with 2 different sizes on the front!!!
Just swap a fullsize from the front to the rear, and put the smaller one on the front, with hubs unlocked in two wheel drive only.
Dont put 2 different sizes on the rear, or lock hubs with 2 different sizes on the front!!!
another point to raise is full-time 4WDs. These bad-boys don't have any hubs to lock in or out. Even though it designed to do it (ie differentiate 
)I wouldn't think a differential, even unlocked, would cope well for an extended period of time no matter which way you put the tyres. In which case 
)I wouldn't think a differential, even unlocked, would cope well for an extended period of time no matter which way you put the tyres. In which case Leave mud piles in the work carpark.
I've never had a full sized spare on the G wagen, and don't have hubs either (but I am not constant 4WD - kooky Germans)
I have had to run a missmatched spare a few times, and it hasn't been a problem.
Don't run in 4WD on hard surfaces (never really a good idea anyway)
Run the smaller tyre on the front.
Won't be a problem to get you home.
Wouldn't run it on the rear of a car with a detroit for any distance at all on tarmac.
33-35" is farily insignificant and I don't really think it would even put that much more heat into the diff of an open diffed car - think about the constant variations when driving on a windy road.
I have had to run a missmatched spare a few times, and it hasn't been a problem.
Don't run in 4WD on hard surfaces (never really a good idea anyway)
Run the smaller tyre on the front.
Won't be a problem to get you home.
Wouldn't run it on the rear of a car with a detroit for any distance at all on tarmac.
33-35" is farily insignificant and I don't really think it would even put that much more heat into the diff of an open diffed car - think about the constant variations when driving on a windy road.
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