will going to bigger tires cause a faulty speedo reading? - Team Camaro Tech
Wheels & Tires What fits what?

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post #1 of 4 (permalink) Old Jan 31st, 05, 08:24 AM Thread Starter
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Location: Houston, Texas
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I was talking to a buddy and he told me that if I go to bigger tires on the car, I run the risk of actually driving faster than what is showing on the speedo. Is this true or not?
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post #2 of 4 (permalink) Old Jan 31st, 05, 08:31 AM
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Yes, you are chaning the ratio but I'm sure someone with more knowledge will tell you that there is something you can do to the speedo where it hooks up to your transmission. That xcell spreadsheet will tell you exactly what change is made going from 15 -> 17 and different tire size. Do you have it/need it? PM me your email adress if so
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post #3 of 4 (permalink) Old Jan 31st, 05, 05:15 PM
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Wider tires won't change your reading, but ltaller ones will.

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post #4 of 4 (permalink) Old Jan 31st, 05, 11:17 PM
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Dawg -

Think of it this way. A tire taller (larger diameter) than stock has to turn fewer times to cover the same distance, while a shorter tire has to turn more times. Again, it's all relative to whatever tire size the speedo gear was set up for.

Changing rear end ratio also has the same effect, more or less revolutions to cover the same distance.

GMJim did a real nice chart to help figure out what you'd need, or at least get close.


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