Shirl

That can convert tire size to gear ratio? In other words, I have 3.15 gears but I raced with 265/35/18's all around. Theoretically, that would change my gear ratio. But what would it change it to?

GARY2004Z06

You would need to know the tire height of your old tires as compared to the tire height of your new tires. Once you know that, you can simply take the ratio between the two and multiply the rear end ratio to get an effective gear ratio. For example, my Z had 3.42s and the F1SC tires (26.1 " in Diameter) and I switched to the Drag Radials (25.2" in Diameter). The solution would be:
26.1/25.2 x 3.42 = 3.54 Effective Ratio
Hope this helps. You could go to the tire manufacturer to view the specs.

Shirl

Cool! Thank you for the info!

JASON99FRC

Go here for all your calculator needs.

http://www.tciauto.com/Products/Tech...culators.asp#4

Shirl

Thanks Jason!