# RC Rollout Calculator — Gear Ratio & Pinion Finder

> Gear Ratio & Pinion Finder (iPhone/iPad app by VOLKER JOOSS.)

- Source: https://appshunter.io/ios/app/rc-rollout-calculator/id6760838974 (this page in markdown: same URL + `.md`)
- Developer: [VOLKER JOOSS](https://appshunter.io/developer/1824395150)
- Category: Utilities, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 26.0 · 9 MB
- Languages: American English, German (Germany)
- Released: 2026-03-23
- Data updated: 2026-06-04
- User reviews in markdown: https://appshunter.io/ios/app/rc-rollout-calculator/id6760838974/reviews.md

## What is RC Rollout Calculator?

RC Rollout Calculator is the essential tool for every RC car enthusiast. Quickly calculate the perfect rollout, find the right pinion gear, and fine-tune your gear ratio — all in one app.

Features:

• Rollout Calculator: Select spur gear, pinion gear, and tire diameter to instantly calculate your rollout value.
• Pinion Finder: Enter your desired rollout, spur gear, and tire diameter to find the matching pinion gear.
• Interactive Tables: View rollout values across different spur/pinion and tire/pinion combinations at a glance.
• Highlighted Selection: Your current setup is highlighted in the table so you can easily compare nearby gear combinations.
• Two Table Modes: Switch between Spur/Pinion and Tire/Pinion tables to explore different setups.
• Portrait & Landscape: Fully optimized for both orientations — compact pickers in portrait, side-by-side layout in landscape.
• No Ads, No Subscription: A simple, focused tool that just works.


## Version history (last 1 release)

### 1.0 — 2026-03-23

No release notes.

## More apps by VOLKER JOOSS

- [Rc Race Timer](https://appshunter.io/ios/app/rc-race-timer/id6748115401)

All apps by VOLKER JOOSS: https://appshunter.io/developer/1824395150

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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 2026-06-04.*