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      09-29-2007, 03:56 PM   #6
Brigadier General

Drives: 4runner SR5
Join Date: Mar 2007
Location: MD

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2007 BMW 335  [4.50]
Originally Posted by mmm def View Post
'What if you run a 17" and an 18" on the drive wheels? Can that mess up the dif/tranny??
If you match the total circumference (wheel+tire) to 2% or under, you are fine for a spare tire that is temporary.

In this case a 17 inch wheel with a height of 45 is very close to equal an 18 with a height of 40. See the circumference calc I posted a link to.

If I had a flat on mine I would be running a 19 for 3 and 17 for one wheel, but because the circumference is close and the use is temporary it works for a spare tire.