Gear Ratio - Racing Forum

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Gear Ratio
Thursday, January 06, 2011 5:39 PM
How would I figure this,
2000 cavalier 5 speed, dirt track racing, I want to go from a 15" wheel to a 13" wheel. then run in 3rd gear instead of second.
how would i go about calculating tire size to keep same rpm on same track?
thanks for the help.
we run a 215/60/15 at most tracks and turn about 7500rpm

Re: Gear Ratio
Friday, January 07, 2011 6:27 AM
A 215/70-13 would be close, just slightly smaller.

Use this webstie to calculate tire sizes.

http://www.miata.net/garage/tirecalc.html






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