# 1\12 Rollout

> 1\12 Rollout (iPhone/iPad app by Alonzo Hess Jr.)

- Source: https://appshunter.io/ios/app/112-rollout/id6824446731 (this page in markdown: same URL + `.md`)
- Developer: [Alonzo Hess Jr](https://appshunter.io/developer/6824446733)
- Category: Reference, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 27.0 · 1 MB
- Languages: American English
- Released: 2026-10-22
- Data updated: 2026-11-01

## What is 1\12 Rollout?

1/12 Rollout is a gearing calculator built for 1/12 scale pan car racers.

Rollout is how far your car travels for one turn of the motor. It's the number that lets you compare gearing across different spurs and tire sizes, and it changes every time you true your tires. 1/12 Rollout works it out instantly.

CALCULATE
• Set your pinion, spur (64 pitch) and rear tire diameter
• See rollout in millimeters or inches, plus final drive ratio
• Step tire diameter in 0.1 mm as your tires wear down

FIND A PINION
• Enter a target rollout and get the exact pinion, the closest pinion you can actually run, and the rollout it gives you
• Pinion chart shows five pinions either side of your current one with FDR and rollout. Tap a row to select it

SAVE SETUPS
• Save any rollout with notes, like "Snowbirds, 17.5 stock, fresh rears"
• Search your saved setups and tap one to load it back into the calculator
• Long press to edit notes, swipe to delete

PRIVATE BY DESIGN
• No account, no ads, no tracking
• Your setups are stored only on your iPhone
Pan cars are direct drive, so rollout = π × tire diameter × pinion ÷ spur. The app does the math so you can spend your time at the track turning laps.

## Is 1\12 Rollout safe?

Not enough ratings yet to assess 1\12 Rollout.

## Is 1\12 Rollout legit?

1\12 Rollout has limited verification signals. The AppsHunter Legitimacy Score for 1\12 Rollout is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.0.1 — 2026-10-29

Fixed a reported issue where the tire size was still showing as mm when inches was selected as the measurement of choice.

### 1.0 — 2026-10-22

No release notes.

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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 2026-11-01.*