# Racing Diffs - Gear ratio — Calculate your gear ratio

> Calculate vehicle top speed per gear based on transmission and differential ratios. (iPhone/iPad app by Mladjan Antic.)

- Source: https://appshunter.io/ios/app/racing-diffs-gear-ratio/id1554897307 (this page in markdown: same URL + `.md`)
- Developer: [Mladjan Antic](https://appshunter.io/developer/521569345)
- Category: Utilities, Lifestyle
- Price: Free
- Rating: 2.50/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 14.4 · 6 MB
- Languages: English
- Released: 2021-03-15
- Data updated: 2026-06-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/racing-diffs-gear-ratio/id1554897307/reviews.md

## What is Racing Diffs?

This application provides accurate top speed calculations based on your transmission ratios and differential gear ratio. It gives you information about maximal speed by each gear.
Variables that you need to fill are:
Tire dimension
Transmission gear ratios
Final drive ratio
REV limit

You can also choose between kmh and mph. 
The info provided by this app is crucial for any track and motorsport enthusiast who wishes to optimize the car's gear ratio to best suit a particular track. It helps you to find the perfect balance between top speed and acceleration which is also the key point for drag racers.

## Key features

- Top speed calculation per gear
- Input tire dimensions
- Input transmission gear ratios
- Input final drive ratio
- Input rev limit
- Supports kmh and mph


## Frequently asked questions about Racing Diffs

### What is Racing Diffs used for?

Racing Diffs is used to calculate your vehicle's maximum speed for each gear. It helps motorsport enthusiasts optimize their car's gear ratios for better performance on tracks or in drag races.

### What information do I need to provide for Racing Diffs?

You need to input your tire dimensions, transmission gear ratios, final drive ratio, and the engine's rev limit to get accurate calculations.

### Does Racing Diffs support different units of speed?

Yes, Racing Diffs allows you to choose between kilometers per hour (kmh) and miles per hour (mph) for your speed calculations.

### How does Racing Diffs help with track optimization?

By providing top speed information for each gear, the app helps you find the perfect balance between top speed and acceleration, crucial for optimizing performance on specific tracks.

### Is Racing Diffs available on multiple devices?

Yes, Racing Diffs is available for iPhone and iPad, as indicated by its support for these devices.

### When was Racing Diffs last updated?

The latest version of Racing Diffs was released on May 24, 2021, with version number 1.0.2.

### What is the user rating for Racing Diffs?

Racing Diffs has a user rating of 2.5 stars based on 2 ratings.

### Does Racing Diffs have ads?

No, Racing Diffs does not contain advertisements.

## Version history (last 3 releases)

### 1.0.2 — 2021-05-24

bug fixes

### 1.0.1 — 2021-03-21

bug fixes

### 1.0 — 2021-03-16

No release notes.

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## More apps by Mladjan Antic

- [Race Buddy: Lap & Drag Timer](https://appshunter.io/ios/app/race-buddy-lap-and-drag-timer/id1440030429)
- [Race Buddy - Laptimer](https://appshunter.io/ios/app/race-buddy-laptimer/id1529631327)
- [CO2 Kalkulator](https://appshunter.io/ios/app/co2-kalkulator/id1542651625)
- [Telemetry Buddy](https://appshunter.io/ios/app/telemetry-buddy/id6755110726)
- [RaceBuddy Overlay](https://appshunter.io/ios/app/racebuddy-overlay/id6760262505)

All apps by Mladjan Antic: https://appshunter.io/developer/521569345

## Related topics

[gear ratio calculator](https://appshunter.io/ios/topics/gear-ratio-calculator) · [ratio gear](https://appshunter.io/ios/topics/ratio-gear)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-03.*