CYCLING
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Focused Drivetrain Tool

Chain Length Calculator

Computes exact geometric chain length and recommended even link count for single-speed, track, or derailleur setups.

Formula & Mechanics
Links = 2*(Chainstay / 0.5) + (Front/4) + (Rear/4) + 1

Powered by our unified DrivetrainCalculationEngine. All metrics remain in sync.

Clean bicycle chain and cassette mechanism
Sizing Chain Links from Chainstay Length and Gearing

1. Drivetrain Setup

Chainrings & Cassette

2. Wheel & Tire Model

Dimensions & Rollout

Calculated wheel dimensions are theoretical estimates. Actual rollout varies with tire pressure, rim inner width, and rider weight. Use measured rollout for highest accuracy.

Track / Fixed GearFixed Gearing

Skid Patch Analysis

For fixed-gear bikes, calculate rear tire wear locations during skid stopping for 50T × 11T.

Single-Foot Skid11 Patches
Ambidextrous Skid11 Patches
More skid patches distribute tire casing wear evenly.
Chain SizingGeometry

Chain Length Calculator

Exact Calculated Links:80.82
Recommended Even Links:82 Links
Round up to nearest even link count when sizing new chains.
Shareable SetupURL Sync

Share Drivetrain Setup

Export your current drivetrain configuration, wheel dimensions, and cadence setup directly into a shareable URL.