# Gear Speed - Brushless RC Speed Calculator

> Brushless RC car gearing and speed calculator with setup storage. (iPhone/iPad app by Ultra Software Solutions, LLC.)

- Source: https://appshunter.io/ios/app/gear-speed-brushless-rc-speed-calculator/id898565895 (this page in markdown: same URL + `.md`)
- Developer: [Ultra Software Solutions, LLC](https://appshunter.io/developer/311196038)
- Category: Utilities, Sports
- Price: $0.99
- Rating: 3.80/5 from 120 App Store ratings · 57 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 2 MB
- Languages: American English
- Released: 2014-07-20
- Data updated: 2026-08-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/gear-speed-brushless-rc-speed-calculator/id898565895/reviews.md

## What is Gear Speed?

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 ussapps.com 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.

## Key features

- Maximum speed calculation
- Setup storage with notes
- Email record keeping
- Speed (MPH/KPH) calculation
- RPM calculation
- Final Drive Ratio calculation
- Rollout calculation (inches/mm)

## What do users think of Gear Speed?

Overall sentiment: negative

**Pros**

- 👍 Easy to use interface
- 👍 Good for RC gearing calculations
- 👍 Provides a good idea of relative speed
- 👍 Useful for trackside decisions
- 👍 Accurate for many users
- 👍 Saves multiple setups
- 👍 Good for "what if" analysis

**Cons**

- 🐛 App crashes on startup
- 🐛 App reverts to home screen
- 🐛 Not working on newer iPhones
- 🐛 Cannot add new setups
- 🐛 Data sometimes resets
- 🐛 Waste of money for some
- 🐛 Incorrect or inaccurate calculations
- 🐛 Lacks advanced features
- 🐛 Basic functionality
- 🐛 Not worth the cost for some

**Commonly reported bugs**

- App reverts to home screen on launch
- App does not work on iPhone 15
- App is stuck and cannot add new setups
- App not working for some users
- App kicks users out
- App opens to a blank screen with a '+' sign, then returns to the phone screen
- App disappears after selecting '+'
- App shuts down after tapping the '+' sign
- Data sometimes resets, requiring re-input
- App used to work but is no longer functioning
- Calculations are wildly inaccurate (e.g., 3467MPH, 3mph)
- App does not have values for differentials
- App tells users their car will only do 3 mph
- App hasn't worked right for a day
- App doesn't allow input for crown gear and pinion
- App doesn't allow selection of gear type (48pitch or mod 1)
- App is roughly 20 mph off compared to GPS measurements
- App doesn't calculate correctly
- App sometimes doesn't save information
- App doesn't go to 34 volts
- App shows crazy mph even with correct input

**Most requested features**

- Add KV and equivalent gear comparison for different pitch sizes (48p, 32p/0.8mod, mod1)
- Include different gear pitch types (e.g., 32p, 48p, mod 1)
- Allow reorganization of lists for grouping models
- Implement a master car list with sub-lists for gear, tire, and battery options
- Lower battery voltage values for drag racing calculations (e.g., 6-7v)
- Allow selection of higher battery voltages (up to 16s)
- Add options for 4-wheel drive calculations
- Include differential gear ratios
- Allow input for multiple gears in a car
- Add ability to input crown gear and pinion
- Allow selection of gear pitch type (48pitch, mod 1)
- Add air resistance and vehicle dimensions
- Allow input for KV less than 500 (e.g., 190kv motor)
- Increase maximum V/Cell beyond 4.30
- Add differential gear ratio input
- Allow input for crown gear and pinion
- Allow selection of gear pitch type (48pitch, mod 1)
- Add air resistance and vehicle dimensions
- Allow input for KV less than 500 (e.g., 190kv motor)
- Increase maximum V/Cell beyond 4.30

## Recent user reviews (10 of 57)

All indexed reviews: https://appshunter.io/ios/app/gear-speed-brushless-rc-speed-calculator/id898565895/reviews.md

### 1/5 — Broken

*2026-03-23, version 2.1.0*

This app cost .99 and does nothing but revert back to my Home Screen when trying to use it

### 1/5 — It doesn't work on my iPhone 15. I don't recommend this program.

*2026-01-06, version 2.1.0*

It doesn't work on my iPhone 15. I don't recommend this program.

### 1/5 — It’s stuck

*2026-01-03, version 2.1.0*

Cannot add new set up

### 1/5 — Not working

*2025-11-26, version 2.1.0*

Not working

### 1/5 — App kicks me out for some reason

*2025-04-16, version 2.1.0*

Waste of money

### 1/5 — I have problem

*2025-03-23, version 2.1.0*

Not that bad

### 4/5 — Suggestion

*2024-10-05*

Only thing this app needs is a kv and equivalent gear comparison between 48p,32p/ 0.8mod and mod1

### 2/5 — RK

*2024-09-10, version 2.1.0*

Not worth the 99 cents. There are ones on line that are better for free.

### 3/5 — Eh

*2024-06-16*

Useful but lately sometimes my days saves sometimes it resets and I have to input the data again!

### 1/5 — Not working

*2024-05-22, version 2.1.0*

It used to work back then now its not

## Frequently asked questions about Gear Speed

### What does Gear Speed do?

Gear Speed is a dedicated tool for brushless RC cars that calculates maximum speed, RPM, final drive ratio, and rollout. It helps enthusiasts optimize their gearing for performance.

### What information do I need to use the app?

You will need to input your car's specific information, including pinion size, spur size, transmission ratio, tire diameter, motor KV, and LiPo cell count and voltage.

### Can I save my RC car setups?

Yes, the app allows you to store your custom setups for different RC cars or configurations. You can also add notes to each setup to track changes and performance during runs.

### What battery types does it support?

The app supports a wide range of LiPo batteries, from 1S up to 12S, allowing for calculations across various power configurations.

### How can I keep a record of my RC car's performance?

You can email your saved setups and run notes directly from the app. This provides a permanent record of your car's configuration and performance data for future reference.

## Version history (last 3 releases)

### 2.1.0 — 2015-09-26

This update from Apple will improve the functionality of this app. No new features are included.

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

### 2.0.0 — 2015-07-31

This version lets you store unlimited setups to quickly tune your car.
Also includes Notes for each preset to document your results and setup changes.
Upgraded to handle 1S to 12S LiPo power.
New app icon!

### 1.0.0 — 2014-07-19

No release notes.

## Apps similar to Gear Speed

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [RC Pit Calc Pro](https://appshunter.io/ios/app/rc-pit-calc-pro/id1562268871) | 4.4 (23) | Free | Utilities |
| [RC Speed Calculator Pro](https://appshunter.io/ios/app/rc-speed-calculator-pro/id6445860835) | 4.9 (23) | Free | Utilities |
| [Rollout Calculator - RC DD car](https://appshunter.io/ios/app/rollout-calculator-rc-dd-car/id6451037467) | 4.9 (7) | Free | Utilities |
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## More apps by Ultra Software Solutions, LLC

- [Gas Mix - 2 Cycle Fuel Mix Calculator](https://appshunter.io/ios/app/gas-mix-2-cycle-fuel-mix-calculator/id313112382)
- [Ian's Laces - How to tie and lace shoes](https://appshunter.io/ios/app/ians-laces-how-to-tie-and-lace-shoes/id364910761)
- [SleepFan: MyFans - Sleep Aid with Recorder](https://appshunter.io/ios/app/sleepfan-myfans-sleep-aid-with-recorder/id406829815)

All apps by Ultra Software Solutions, LLC: https://appshunter.io/developer/311196038

## Related topics

[rc speed calculator pro](https://appshunter.io/ios/topics/rc-speed-calculator-pro) · [rc gear calculator](https://appshunter.io/ios/topics/rc-gear-calculator) · [rc rollout calculator](https://appshunter.io/ios/topics/rc-rollout-calculator) · [rc gears](https://appshunter.io/ios/topics/rc-gears) · [moto gear ratio calculator rpm](https://appshunter.io/ios/topics/moto-gear-ratio-calculator-rpm)

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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 2026-08-25.*