# RC Car GearCalc

> A simple application for calculating parameters gearing for your RC car.

Canonical page: [https://chrome-stats.com/d/redscrew.gearcalc](https://chrome-stats.com/d/redscrew.gearcalc)

## Overview

- **ID:** `redscrew.gearcalc`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** redscrew.com
- **Category:** TOOLS
- **Downloads:** 40,913
- **Rating:** 4.29 / 5 (125 ratings)
- **Version:** 1.1.19
- **Last updated:** 2025-08-20
- **First published:** 2018-01-01
- **Publisher country:** SK
- **Size:** 3.30 MB
- **Data as of:** 2026-09-12
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=redscrew.gearcalc)
- **Website:** [http://www.redscrew.com](http://www.redscrew.com/)
- **Privacy policy:** [https://redscrew.com/index.php/privacy-policy](https://redscrew.com/index.php/privacy-policy)

## Description

**RC Car GearCalc** is a simple yet powerful Chrome extension designed to help RC car enthusiasts and racers calculate essential gearing parameters for their vehicles. Proper gearing optimization is crucial for maximizing your touring car's acceleration and top speed by determining the ideal rollout — the distance your car travels per motor revolution. This tool lets you easily compute key ratios such as the transition ratio, primary drive ratio, and final drive ratio based on your car and tire specifications.

Understanding the nuances of gearing, including how tire diameters affect rollout, RC Car GearCalc offers precise calculations that adapt dynamically whether you're using foam or rubber tires, factoring in wear and tear. Whether you're tuning for quick acceleration or top-end speed, this extension simplifies complex computations for efficient and effective RC car tuning, making it an essential companion for hobbyists focused on performance optimization.

## Rankings

- #325,954 — Overall

## Permissions and access

### Permissions

- `android.permission.FOREGROUND_SERVICE`

## Review summary

RC Car GearCalc is praised for providing reliable speed estimates and useful gearing calculations, especially given that it's free. Users appreciate adjustable settings and unit conversions. However, multiple users note the inability to save multiple car profiles as a major limitation. Beginners find the app hard to navigate without explanatory tips, and some desire a more appealing interface. Other minor issues include limited spur gear tooth options and unit display preferences. Overall, it serves well for tuning and speed estimation but could improve on usability and features for multiple cars.

### Pros

- Provides a good estimate of RC car top speed.
- Free and useful tool for experimenting with gearings and setups.
- Allows switching between metric and standard units.
- Includes adjustable settings like gear size ranges and voltage sliders.
- Helpful for speed runs and general RC car setup.

### Cons

- Cannot store or save multiple model/car setups.
- Lacks tips or beginner guidance on gear ratios and calculations.
- Interface is dull and could be improved visually.
- Limited spur gear tooth options (minimum 50 teeth) which restricts some users.
- Missing simultaneous display of units (e.g., mm tire size and mph).

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Source: [Chrome-Stats](https://chrome-stats.com/d/redscrew.gearcalc)