Overview Chat Bike Members News Women
Viewing 8 posts - 1 through 8 (of 8 total)
  • 10 speed rear mech with a 9 speed cassette?
  • didgy2
    Free Member

    Went out last night and broke my XTR derailleur. i am due to do Brecon beast on Sunday so in my haste to order a new one last night i’ve noticed i must have clicked on 10 speed not 9. Not going to have time to return and get another one by Friday so would anyone know if i can run a Shimano XT M786 2013 10 Speed Shadow with my 9 speed XTR drive chain? 😳

    Posted 10 years ago
    fadda
    Full Member

    Sorry, pull ratios are different, so indexing will be borked…

    Posted 10 years ago
    richpips
    Free Member

    As above, it won’t work.

    Posted 10 years ago
    didgy2
    Free Member

    Thanks, 1/2 day off work to get another then!

    Posted 10 years ago
    paul4stones
    Full Member

    Isn’t the indexing related to the shifter rather than the mech?

    Posted 10 years ago
    momo
    Full Member

    7/8/9spd shimano shifters use a different actuation ratio to 10spd mtb ones, so the mech wouldn’t move the right distance to correspond with the centre line of the rear sprockets iirc.

    Posted 10 years ago
    paul4stones
    Full Member

    Ah right. My son ripped his new sora 9sp mech off his cx bike last week and I was surprised to find a 25yr old rear mech worked fine as a temp measure. That was probably 7 or 8 speed so would work with 9. Cheers.

    Posted 10 years ago
    richpips
    Free Member

    Isn’t the indexing related to the shifter rather than the mech?

    10 speed shimano mtb stuff doesn’t have equal amounts of cable pull between each gear at the shifter end, and the mech design reflects that.

    Posted 10 years ago
Viewing 8 posts - 1 through 8 (of 8 total)

The topic ‘10 speed rear mech with a 9 speed cassette?’ is closed to new replies.

Overview Chat Bike Members News Women