# Fixed Gear Skid Calculator — Gear Ratio & Tire Wear

> Gear Ratio & Tire Wear (iPhone/iPad app by 文仲 张.)

- Source: https://appshunter.io/ios/app/fixed-gear-skid-calculator/id6793187875 (this page in markdown: same URL + `.md`)
- Developer: [文仲 张](https://appshunter.io/developer/6788944921)
- Category: Sports, Utilities
- Price: $1.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-08-07
- Data updated: 2026-08-09
- User reviews in markdown: https://appshunter.io/ios/app/fixed-gear-skid-calculator/id6793187875/reviews.md

## What is Fixed Gear Skid Calculator?

Find a near-identical fixed-gear ratio with more repeated tire-contact positions—using only the chainrings and cogs you actually own.

Start with your current setup or a target gear-inch value. Fixed Gear Skid Calculator checks every combination in your gear bag, keeps only the matches inside your chosen tolerance, and ranks them by skid-patch count.

ONE CLEAR FIXED-GEAR JOB

• Calculate one-foot and either-foot skid-patch counts
• Reduce each chainring/cog pair to its exact integer ratio
• Rank owned parts near a target gear-inch value
• Set a visible gear-feel tolerance from ±0.5% to ±10%
• Compare gear inches and metric development
• See speed at your chosen cadence in mph and km/h
• Enter comma-separated tooth counts or ranges such as 45–49
• Use the conventional 27-inch nominal method or your own wheel values

PRIVATE AND DEPENDABLE

No account. No ads. No tracking. No analytics. No network connection. All calculations happen on your iPhone.

SAFETY

This app explains gearing and repeated tire-contact positions. It is not braking or safety advice. Follow local laws, inspect your tire and drivetrain, and ride with properly maintained brakes.

One paid download. No subscription and no in-app purchases.


## Version history (last 1 release)

### 1.0 — 2026-08-07

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 2026-08-09.*