Free Tool
Chain Length Calculator | Sports Calculator
Chain Length Calculator - Chain length = 2(chainstay/25
Built by an engineer who chases finish lines and is obsessed with data. Thomas Prommer — technology executive who has worked with Google, Apple, Nike, Adidas, Netflix and other global brands. Also an Ironman finisher, HYROX Pro Division competitor, and marathon runner. These tools combine engineering rigor with real race experience.
Chain Length Calculator
Chain length = 2(chainstay/25.
Methodology
Chain length = 2(chainstay/25.4) + (max chainring + max cog)/2 + 1. Add 2 links for full suspension. Shimano method.
FAQ
How does this calculator work?
Chain length = 2(chainstay/25.4) + (max chainring + max cog)/2 + 1. Add 2 links for full suspension. Shimano method.
How accurate is this?
Based on established sports science formulas and research.
Who should use this?
Athletes, coaches, and fitness enthusiasts of all levels.
Should I consult a professional?
Yes, especially before major changes to training or for health conditions.
Results are estimates. Consult a professional for personalized guidance.