Why do some Shimano rear derailleurs have an adjustable cage spring tension and what is affected by increasing it (default is low tension)?

enter image description here

1 Answer 1


It's a way of mitigating chain slap and chain retention issues, primarily for more aggressive riding styles. The tradeoff is drivetrain efficiency and shifting smoothness. It's a feature that's basically been supplanted by rear derailer clutches.

  • Lower tension, standard position: quicker shifting but risk of unwanted chain behaviour. Higher tension; if the standard setting doesn't work mainly because of bumpy riding conditions but requiring a more precise derailleur adjustment.to ensure correct gear changes.
    – Carel
    Dec 4, 2017 at 17:16

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.