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Chain Length Calculator
Find derailleur chain length using the Park Tool formula
📖 Chain Length Calculator
For multi-speed bikes, chain links ≈ 2 × chainstay + (chainring/4) + (cog/4) + 1. Always round up to the next even number of links.
📊 Result
💡 Tips & Information
- Wrap chain around big-big WITHOUT derailleur to double-check length.
- Full-suspension bikes may require extra links for chain growth.
- Always size chains using the largest chainring and cog combo.