Gear Speed - Brushless RC Speed Calculator 4+

Ultra Software Solutions, LLC

Designed for iPhone

    • #131 in Utilities
    • 4.0 • 72 Ratings
    • $0.99

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 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

This app has been updated by Apple to display the Apple Watch app icon.

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

Ratings and Reviews

4.0 out of 5
72 Ratings

72 Ratings

j95svt ,

Very useful

Very useful but could be a little better. Using this for drag racing I am pulling down to 3.4 per cell and I can’t duplicate that.

NYKID158 ,

Can’t select gear type ?

The app is excellent except for the most vital component, being able to to choose the gear type whether they are 48pitch or mod 1 gear size for example. That allows you to further calculate speed otherwise your calculations will always be off to some degree. Please fix this as all of my calculations were wrong, I found this out after I purchased a GPS and did a few passes on 4s on my rustler 2wd. Please fix, once corrected I will pull my review and re-do.

Dynafld103 ,

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.

App Privacy

The developer, Ultra Software Solutions, LLC, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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