Chain length with chain device - anything different?

me-109
me-109 Posts: 1,915
edited February 2016 in MTB workshop & tech
Swapping over my lad's bike from 8sp to 9sp since his rear mech is bent and I've a few bits spare. It's a single ring front with a chain device. The new cage is longer than old one so can't replicate chain length. Is it just round the big sprocket and add 2 links, or does the chain device affect length any?

Comments

  • nicklouse
    nicklouse Posts: 50,675
    depends on the device. if it has a lower roller that holds the chain on the ring then yes you need it in place.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • me-109
    me-109 Posts: 1,915
    Yep, it has a little roller so I know it goes over that. Just wondering if that would need a longer chain or would that half-defeat the purpose by adding too much slack for the mech to take up.
  • Chunkers1980
    Chunkers1980 Posts: 8,035
    No chain length needs to be the correct length for the system. If the device is shortening it then that needs to be compensated for

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