Yukon Re-Gear Kits allow you to restore or enhance the performance of your truck and reap the traction benefits of big tires. Big tires impact acceleration, freeway cruising, towing capability, and many aspects of off-road performance. Going big-tire is not as simple as bolting on those 40 inchers and hitting the road. Make note of the number in the gear ratio box and you’re ready to shop ring and pinion gear sets. Then enter your new tire diameter and adjust the gear ratio field, evaluating different gear sets until you find one that best matches your expectations. You will need to pre-figure the tire heights of all the tires you are considering upgrading to and have those numbers handy. a trail-only rig that will not see freeway speeds very often or a rock crawler that will not be see the street at all. Going in you should know what your performance goal is… to replicate stock performance or enhance performance at a given speed, i.e. Calculate at a variety of vehicle speeds… especially freeway speeds. If you want to make a smaller, or larger, version of a weave, your aspect ratio still needs to be a particular number for certain chainmaille weaves. If two jump rings have the same wire gauge, but the inside diameter of one is smaller, that jump ring has a smaller aspect ratio. Use your stock set-up as a baseline before changing the formula for a larger set of tires. Smaller aspect ratio jump rings also tend to be stronger. Using the Calculator for Big-Tire Upgrades The boxes are labelled Auto, AOD, Manual, and 5 Speed… simply refer to the box that best matches your transmission type. Each box represents a transmission type and takes into consideration how gear reduction within the transmission will impact the final engine speed readings. The calculator will display the engine rpm for the selected vehicle speed in four boxes below the calculator. Some tires can be nearly a half an inch off their classification so you may want to research the tire manufacturer’s website to get the most accurate info.Īrmed with the correct info, it’s time to feed the ratio and tire height numbers into the calculator, select the vehicle speed you want to tabulate engine rpm at, and press the Solve button. For instance a 35x12.50-17 Mickey Thompson Baja Boss M/T is 34.6 inches in circumference mounted on a 9.5-inch-wide rim… 34.8 inches in circumference on a 10-inch rim. If you’re contemplating upgrading to larger tires like 35, 37, or 40 inchers know that the height on the tire is a classification, not a specification. It uses tire width, tire aspect ratio, a wheel diameter to provide the height in inches. Tire height can be ascertained by another calculator on our site. If your ring and pinion gears are at hand you can count the teeth on each and use our Gear Ratio Calculator to determine the ratio. Your stock gear ratio can be researched online, it may be in your vehicle’s owner’s manual, or on a tag affixed to the differential cover. The RPM Calculator requires the vehicle’s gear ratio and tire height to make its calculations. The calculator determines your engine rpm at a selected vehicle speed. An RPM Calculator is especially valuable to those considering jumping to a bigger tire, altering their vehicle’s performance by changing ring and pinion gears, or satisfying a curiosity about their current setup.
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