Question about tires

Originally Posted by Davey

Your math is not exactly correct. That's not getting you 1.1" of ground clearance.

You are right, it's about 1" taller overall. Think about it; if you add 1" to the diameter you are only adding 1/2" to the radius. About 3.5% increase, it's not too far out of spec but it's only getting you 1/2" in actual clearance.

So your speedo will read a little low (off by less than 3 mph at legal speeds) and your gearing will be a little higher and your car will be 1/2" higher off the pavement.