A simple application for calculating parameters gearing for your RC car.
About RC Car GearCalc
RC Car GearCalc is a tools app developed by redscrew.com.
Download Statistics
RC Car GearCalc has been downloaded 41 thousand times. In the last 30 days, the app was downloaded 160 times.
User Ratings
RC Car GearCalc is rated 4.23 out of 5 stars. The rating is based on 120 ratings.
App Information
RC Car GearCalc is FREE to download. The APK download size is 3.30 MB. The latest version available is 1.1.19. The last update was on August 20, 2025.
Technical Requirements
RC Car GearCalc requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play January 2018.
Description
GEARING Proper gearing is one of the most essential tuning options required to maximize the performance potential of a touring car. The key to proper gearing is finding and maintaining the best rollout for each track environment, motor/chassis setup and driving style. Rollout is the distance a car will travel in one revolution of the motor shaft. Pinion and spur gears are used to generate the rollout desired, considering the diameter of the tires mounted. Rollout determines top speed and acceleration. Usually a higher rollout will provide less acceleration and more top speed, and a lower rollout will be quicker off the line, but with less top speed.
TRANSITION RATIO The transition ratio is the ratio of all the internal gears from the transmission, including differentials and pulleys. The transition ratio is usually different for each model of car. Your owner’s manual should provide this information, but keep in mind that some manufacturers use the words transmission reduction to indicate the transition ratio. The transition ratio in most cases cannot be changed, unless you are able to change the number of teeth on the pulleys and/or gears.
PRIMARY DRIVE RATIO The primary drive ratio is the ratio between the pinion and spur gear. This number is commonly rounded up to the nearest thousandth after the decimal point.
FINAL DRIVE RATIO The final drive ratio is the ratio between the transition ratio and the primary drive ratio.This number is commonly rounded up to the nearest hundredth after the decimal point.
ROLLOUT Rollout is the distance that the car moves forward for one revolution of the motor shaft (or pinion gear). Rollout is not affected by the motor, batteries, or electric components you are using; it simply defines how all of the gears, belts/shafts and tires work together to make the car accelerate and reach top speed. Rollout is calculated using the circumference of a tire and therefore the diameter of both foam and rubber tires make a difference. The diameter is more important if using foam tires since they can be used with a diameter anywhere from 64 mm down to 54 mm. As foam tires wear and get smaller, your rollout value will change a lot more quickly. Rubber tires do not wear down nearly as quickly or as much so the change to rollout will be very small over time.
Get a detailed PDF report for RC Car GearCalc with download trends, rating history,
and key performance statistics — useful for competitive research or tracking your own app.
Learn more
Are you the developer of this app? Join us for free to see more information about your app and learn how we can help you promote and earn money with your app.
Best one if your doing tire, pinion and battery swaps. This app allows you to switch metric to standard includes battery voltage, speed tire diameter. Only thing I would change would be maybe having both mph and kilometers, maybe. It's pretty good as is I appreciate the work
★★★★★Mikko Holopainen· Sep 3, 2020
Otherwise good, but spur gear can't be lower than 50 *Edited, silly me, didn't notice setting. 5star and fast responce from Dev👍
★★★★★Landsil· Apr 18, 2021
Nice app, It would be good to be able to save settings for multiple cars and add motors.
★☆☆☆☆motomavrick· Mar 19, 2026
The words are cut in half on the calculator and on another page the values are cut in half. This app is useless!!!!
Google Play Rankings for RC Car GearCalc
This app is not ranked
Technologies used by RC Car GearCalc
RC Car GearCalc is requesting 1 permissions and is using 17 libraries.
Show details
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
