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Old 03-01-2012, 06:32 PM
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Effect on differential with two different size tires?

I have a car with 25 inch diameter tires on the front, and 29 inch diameter tires on the rear, with a generation 3 Corvette rear end. I would like to install a spare tire and it would have to be the 25 inch diameter size. (the 29's would not fit on the front).

My question is if I have a flat tire on the rear, would it have an adverse effect on the differential if I had the 25 inch diameter tire on one side, the 29 inch diameter on the other side, and drove the car 10 miles to get home?

If so any suggestions?

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Old 03-01-2012, 07:03 PM
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Tire stagger

Nascar and local racers run what they call tire stagger larger diameter tires on one side of the car versus a small diameter on the other side. To make the car steer a or push. It never hurt their rear axels. Most are non detroit lockers.
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Old 03-01-2012, 07:05 PM
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This has been argued about for years, but it's the same thing as cruising on a long curvy mountain road. One tire has to turn at a different rate of speed from the other. Just keep the distance reasonable (don't get on the interstate heading for California), and you'll be okay.
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Old 03-01-2012, 07:29 PM
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agreed, as long as its a spare, and you treat it as a spare(not driving over 60mph and not too far or long periods), you should be all good!
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Old 03-01-2012, 08:21 PM
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Also agreed...What happens is the 25'' tire is spinning its side gear in the diff at 1 speed,and the 29'' tire is spinning it's side gear at a slower speed,putting pressure on that gear,as well as the center spider gears....a minor bind up,for lack of a better term....but by following NINE4GMC's guidelines, you'll be fine,if the situation arises.
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Old 03-01-2012, 08:37 PM
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Two things come to mind:

Are you running a Detroit locker?

Are the tires half full or half empty?
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Old 03-03-2012, 08:08 PM
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Quote:
Originally Posted by HotRodMan
My question is if I have a flat tire on the rear, would it have an adverse effect on the differential if I had the 25 inch diameter tire on one side, the 29 inch diameter on the other side, and drove the car 10 miles to get home?
No. .
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