01stangt

I searched and couldn't find it, but i'm trying to find out how many rpm's i would be at with 4.10 gears and 4.30 gears going 70 mph and 55 or 60 mph....thanks guys.

GT_Bob

This calculator is as basic as it gets. Let me know if you need a more in depth one.


http://www.mustang123.com/calculator...Calculator.asp

01stangt

lol so if my tires are 245/45/17 my tires are 45 inches tall? if not please let me know[]

GT_Bob

You're killing me.

Do you need a tire converter as well?

http://www.s-series.org/htm/calc/tiresizeconv.htm

01stangt

lol thanks man.

GT_Bob

You are welcome. Just remember that those, (and all), calculators are based on mathematical equations and may not be accurate in real world applications. Obviously if you have an auto, your rpm's will be slightly higher due to the friction loss through the plates and slippage in the torque converter. But, they are a handy "estimation" tool to give you a general idea of how gear ratio, tire size and rpm's are all related to each other.

Have fun.