iPhone Screenshots


Gear Speed is the best gearing tool for your brushless RC car. Forget the slow web calculators with limited features. Gear Speed was designed for you and your speed quest.

Gear Speed calculates your maximum speed. It stores your setups, allows you to include notes for your runs and your setup changes. You can also email this information for permanent record keeping.

Calculates: Speed (MPH/KPH), RPM, Final Drive Ratio, Rollout (now in Inches and MM).
Given: Pinion Size, Spur Size, Transmission Ratio, Tire Diameter (inches/mm), Motor KV, LiPo cell count and cell voltage.

Gear Speed now handles from 1S to 12S LiPo batteries.

Please contact us at ussapps.com to let us know how to make this app even better. Happy racing!

* Note: The above screens are sample setups, you will need to enter your own car's information.

What's New

Version 2.1.0

- Rollout now in Inches or MM
- Improved Notes View Contrast

Ratings and Reviews

3.9 out of 5
13 Ratings
13 Ratings

Needs work

I'm only giving it 3 stars because I tricked it to work. Need a way to set differential gear ratio. I tried calculating speed of new xmaxx. Found several calculators that work great online and figured I'd try the app. The only way I managed to get the app to produce close to accurate speeds was to set cell voltage to 3.75 and cells on 2. I'm appalled that I paid for an app that isn't actually accurate when it's marketed as a calculator.


Great Trackside Tool! 👍🏼🔧

It's accurate, easy, and intuitive. Make trackside gearing decisions with confidence. No problems at all from download to everyday use, it works like a charm. For those of us old-school guys, the email and export features make keeping a hard-copy record easy to do.

not a goodday

So so

When you put the information in it sometimes safe stay information I went to a big race put information in what I had the next day it was totally gone


Jason Johnson
2.1 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2008 Ultra Software Solutions


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    With Family Sharing set up, up to six family members can use this app.

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