Speedometer Gear Calculator
Physics & EngineeringCalculates the correct speedometer driven gear tooth count for a tire diameter and axle ratio, so the speedometer reads accurately.
Revolutions per Mile
How many times the tire rotates per mile driven.
Recommended Driven Gear Teeth
121
The driven gear tooth count needed for an accurate speedometer reading.
Found this calculator useful?
From Scratch To $10K/Month In 60 Days
This is a proven money making system that takes students by the hand to make at least $10,000 per month, every month. Students get 12 weeks of guided coaching in addition to the "MPS Super Funnel" and tools.
We value your privacy and promise not to sell or misuse your information. Here's our privacy policy.
Calculator Stats
Creators
Odeh Ahwal0people find this calculator helpful
Views
Helpful
Saved
Embeds
Physics & Engineering calculators
Calculator Stats
Creators
Odeh Ahwal0people find this calculator helpful
Views
Helpful
Saved
Embeds
Physics & Engineering calculators
Frequently Asked Questions
Why does tire size affect speedometer accuracy?
A speedometer is calibrated to the rolling distance per rotation of a specific tire diameter -- fitting a different tire diameter changes how far the vehicle actually travels per wheel rotation, throwing off the speedometer unless the drive gear is recalculated to match.
Spot a mistake? Tell us what's wrong.
Request a calculator. The most-requested ones get built first in our monthly batch.
Request a calculatorWant this calculator on your website?
Embed the Speedometer Gear Calculator on any site — no code needed. Customize colors, remove branding, and track usage.
