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Speed calcuation problem.

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Old Feb 8, 2010 | 04:50 AM
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CamaroIROC88350's Avatar
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Speed calcuation problem.

When I bought my car it already had a newer set of tires on it. Now my car came with the stock 245/50/16's but somebody at some point put 215/60/15's on my front end & 235/60/15's on my rear.

I don't know why they put 15" rims/tires on the car because they're ugly.

Anyway, I've found lot's of calculators online for tire = mph ratio's but I have not been able to find anything to calculate what I have now. If you know or can direct me to a website that shows me I'd appreciate it.

By the way, I just bought new tires & I got some 16" Z28 rims now. The tires I bought are 16" tires obviously.
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Old Feb 8, 2010 | 08:50 AM
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PetesPonies's Avatar
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Re: Speed calcuation problem.

Your tires now are 1/2" taller. That gives you about a 2% error on the speedometer, reading slightly slower than you are actually going.
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