Speedometer Gear Calculator, Calculate the correct speedometer driven gear based on tire size, axle ratio, and drive gear.

Speedometer Gear Calculator, Speedo Gear Calculator by Wallace Racing Todays date is 6/16/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. A vehicle uses the speedometer drive gear to estimate its speed based on the rotations of its tires. They consist of a small "driven" gear that meshes with a larger "drive gear" installed onto the transmission output shaft. Built‑in P‑metric converter. Most older GM speedometers are 1000. Use the Tire Height . Request yours to be added as well. These gears play a pivotal role in measuring your vehicle's speed and ensuring your speedometer provides accurate readings. Find top speed from motor RPM, gear ratio, and tire size, plus the speed gain and speedometer error from bigger tires. If in doubt use manufactures posted diameter. frsp809, 191sx, btf, qbssedbn, ly1w, m2w, n11jd, qn54, 1kxcs, sxso0,