**Now that you have your truck lifted, you want bigger meats. They look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. This gear calculator will get you back to a ratio that's closer to your original. Enter the values on the left and press Compute, the gear calculator will take care of the rest. **
## Gears from Rocky Road
**Ever wonder how far off your
speedometer is with your new bigger tires? This uses a simple ratio calculation, so the
info will only approximate your corrected speed and depends on the accuracy of tire size
diameters (assuming nothing but tire size has changed). **
**Ever wonder what your low-low-low
gear ratio is, your "crawl ratio"? You'll need to do a little research by
finding out the transfer case and transmission ratios first. Enter your values on the left
side, press Compute and your answer will be on the right. **
**Eliminate that WAG (wild a$$ guess) on your actual M.P.H. when going down the road. By knowing your gear ratios and tire size you'll get a more accurate idea here. Enter the value on the left, press Compute. **
**If you don't have a tachometer you could use this form, otherwise it's only useful to find out how accurate your Tach is. Enter the values on the left, press Compute. **
**This
formula is a nice way to get
the tire diameter of those
metric tires that are common
on just about everything
stock. For example a
265/75R16 would be around
31.6 inches tall. Enter the
numbers into this form in
the order you read them from
the tire and press Compute. **
Credit for this calculator goes to Mark Medina. If you would like to see Marks page go here.** ** **
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