Axle Ratio/Tire Size Calulator 1.1 Here are a few calculators that may be useful in deciding tire size, gear ratios, and other stuff. These calculators created by Mark Medina - http://www.4lo.com/
RTI Ramp Index at 4lo.com
RTI Ramp Index at 4lo.com Ever wonder how far off your speedometer is with your new bigger tires? I'm using a simple ratio calculation, so this info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assumimg nothing but tire size has changed).
RTI Ramp Index at 4lo.com Ideal gear ratio CHART at 4lo.com 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 calculator will get you back to a Gear Ratio that's closer to your original. Enter the values on the left and press Compute.
RTI Ramp Index at 4lo.com 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.
RTI Ramp Index at 4lo.com I've spend a bunch of time trying to WAG (wild ass guess) my actual MPH 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. I suppose if you don't have a tachometer you could use this form. Otherwise it's useful to find out what your RPMs will be after you change gears and /or tire size. Enter the values on the left, press Compute.
RTI Ramp Index at 4lo.com This formula is a nice way to get the tire diameter of those P-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. |