Quote:
Originally Posted by PureCaboose
Is the spare the same size as the other 4 tyres? If it is not, then technically it is not a valid spare tyre and you can be defected for it! Before everyone jumps in, IF you have a spare tyre in your vehicle, it MUST be suitable and legal for use. That means the same rolling diameter as the remaining tyres. It can be a different size, width, profile etc but it must be the same rolling diameter.
That aside, putting on a smaller tyre on one side of the axle will lead to the spider/sun gears rotating when they normally do not. This well lead to excessive wear and or heat in the differential. Not to mention the ESP and traction control will more than likely go spastic.
I always do a 5 tyre rotation, otherwise you end up with a massive difference on the spare tyre. Especially if you run mud tyres like we do on our Jeeps.
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Are you sure it has to be the same? How do you technically explain space saver donut spares? They are legally on many cars from the factory.