Frequently Asked Questions
Why must chain length always be an even number of links?
A standard derailleur chain alternates inner and outer plates. For the chain ends to join - whether with a master link or a pin - one end must be an inner plate and the other an outer plate. That is only possible on an even total link count.
What happens if my chain is too long?
A chain that is too long sags, slaps against the chainstay, and can derail into the spokes or jam the rear derailleur. Shifting quality degrades, especially in small-small combinations. In the worst case, a long chain on a mountain bike with a clutch derailleur may not take up enough slack to prevent a dropped chain.
Does this formula work for 1x drivetrains?
Yes, for the rigid method simply use F as the single chainring tooth count and R as the largest cog. Some manufacturers of 1x systems with clutch derailleurs recommend the wrap-around method (thread through big cog and single ring without the derailleur, then add two links), which sometimes gives a slightly longer result.
What chainstay length should I enter if I have a size range?
Use your specific frame's chainstay dimension, found in the geometry chart of your bike's manual or manufacturer website. For most road bikes this is 405-415 mm (15.9-16.3 inches); mountain bikes range from 420 to 450+ mm. Enter the actual number, not a round estimate.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.