Gear Speed and Tire Size

Gear Speed and Tire Size

by Scott Galaba

0 ratings
3 reviews
$1.99 $0.99

Price history


Details

  • Released
  • Updated
  • October 26, 2015
  • August 11, 2026

Features

Gear Speed and Tire Size screenshot #1 for iPhone
Gear Speed and Tire Size screenshot #2 for iPhone
Gear Speed and Tire Size screenshot #3 for iPhone
Gear Speed and Tire Size screenshot #4 for iPhone
Gear Speed and Tire Size screenshot #5 for iPhone
iphone
ipad
🖼️Get Icon
Icons↘︎

About

Calculate and compare transmission gear ratios with various tire and wheel sizes. Visualize results with interactive graphs and save them as PDFs. Includes calculators for gear speed, and both inch and millimeter tire sizes.

Gear speed and tire size comparison
Interactive gear speed graph
Printable/savable PDF results
Multitasking support for iPads
Three distinct calculators
Adjustable RPM data points
Show original description
+1

What's New in Gear Speed and Tire Size

4.1.7

August 11, 2026

Minor code update

User reviews

Good idea, sharing is iffy

The overall concept is great.
However, when trying to share a PDF of the results it is slow to update the data. It often uses the previous data for several shares before finally picking up the newly input data to populate the sheet with. This is aggravating to say the least when trying to compare tire sizes and performance.
Show more

:/

Redline only goes to 8k, needed it to rev to 9-10k...feels like I just wasted a dollar...

RPM to MPH/KPH

Very nice app that converts engine rpm to vehicle speed by taking into consideration transmission gear ratio, final drive ratio, and tire size. Results are presented in a table, a comprehensive graph and printed document. My Dodge Charger has an 8 speed AT that can be switched into a paddle shifted MT and this app handles all 8 ratios. In addition when I change between the Dodge approved 20 inch summer and the 18 inch winter tires, this app calculates any resulting vehicle speed differences. You can also input the new gear ratio if you're one who changes out the rear axle gearing for street vs. track. Author is responsive to suggestions and continually seeks ways to improve the app. Well done.
Show more

Developer apps

FAQ

What is Gear Speed and Tire Size used for?

Gear Speed and Tire Size is used to compare different tire and wheel combinations to transmission gears and differential ratios. It helps users calculate gear speeds for various configurations and analyze their impact on vehicle performance.

Does Gear Speed and Tire Size have ads?

No, Gear Speed and Tire Size is ad-free. Users can enjoy the full functionality without any advertisements interrupting their experience.

How much does Gear Speed and Tire Size cost?

Gear Speed and Tire Size is a paid application, available for a one-time purchase of $0.99.

What devices is Gear Speed and Tire Size compatible with?

Gear Speed and Tire Size is compatible with both iPhone and iPad devices, supporting multitasking features on the latest iPads.

How often is Gear Speed and Tire Size updated?

The app was last updated on December 13, 2025, indicating ongoing support and potential for future improvements and bug fixes.

Can I export my calculations from Gear Speed and Tire Size?

Yes, you can print or save your calculations into a PDF by selecting the 'Share PDF Results' option within the app.

What age rating does Gear Speed and Tire Size have?

Gear Speed and Tire Size has an age rating of 4+, making it suitable for a wide range of users.

What are the different calculators included in Gear Speed and Tire Size?

The app includes three calculators: a Gear Speed Calculator for calculating speed based on tire size and gear ratios, a Tire Size Calculator for comparing original equipment tire sizes in inches, and a TMX Tire Size Calculator for comparing sizes in millimeters.