# Gear Speed - Brushless RC Speed Calculator

> Utilities

Canonical page: [https://chrome-stats.com/d/id898565895](https://chrome-stats.com/d/id898565895)

## Overview

- **ID:** `id898565895`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Ultra Software Solutions, LLC
- **Category:** Utilities
- **Rating:** 3.80 / 5 (120 ratings)
- **Version:** 2.1.0
- **Last updated:** 2015-09-26
- **First published:** 2014-07-20
- **Size:** 2.28 MB
- **Data as of:** 2026-09-19
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/gear-speed-brushless-rc-speed-calculator/id898565895)

## Description

Gear Speed is the premier gearing tool for brushless RC cars. It calculates maximum speed, RPM, final drive ratio, and rollout (in inches and mm) for 1S–12S LiPo batteries.

The extension stores your setups, allows you to add notes for each run and setup change, and can email results for permanent record keeping. By inputting pinion size, spur size, transmission ratio, tire diameter, motor KV, and LiPo cells/voltage, Gear Speed delivers accurate speed data to help you optimize your gearing.

## Rankings

- #136,099 — Overall

## Review summary

Reviews are mixed. Many praise Gear Speed as a useful RC gearing calculator that helps visualize how gear changes affect speed and can provide theoretical estimates when it works. However, multiple users report crashes, blank screens, or data loss; essential gear options and drivetrain features are missing; speed predictions can be inaccurate or inconsistent; and several feel the price isn’t worth it compared with free alternatives. Overall, it can be helpful when functioning, but reliability and feature gaps are frequent concerns.

### Pros

- Provides gear-speed calculations/theoretical speed for RC setups
- Useful tool for RC enthusiasts; helps visualize how gear changes affect speed
- Works as intended when functioning; users report it delivers results as advertised
- Helpful for RC tuning and planning (e.g., drag racing applications) for some users

### Cons

- Crashes or fails to launch: blank screens, + sign leads to app disappearing, returning to device home screen
- Missing essential gear configuration options (gear pitch types like 48p/32p, mod1; inability to select gear type; no differential/4WD settings)
- Accuracy issues: predictions can be wildly inaccurate or inconsistent (e.g., mph estimates, post-update changes)
- Low perceived value: many users feel the $0.99 price is not justified given free online alternatives
- Data persistence problems: saves can reset or data input is lost/repeatedly required

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Source: [Chrome-Stats](https://chrome-stats.com/d/id898565895)