Shimano M9000 chainring

yroz
yroz Posts: 4
edited May 2016 in MTB workshop & tech
I have a 36 teeth chainring on my M9000 XTR cranckset and wish to fit 38 or 40 one. Shimano does not specify such an option, but there are 38 and 40 rings on the double and triple M9000 respectively. As I understand, both use 96 BCD. Will they fit? Any issues I should consider? Thanks for any help.

Comments

  • cooldad
    cooldad Posts: 32,599
    Double and triple rings have ramps etc built in to assist shifting, so single specific rings will work better.
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  • The Rookie
    The Rookie Posts: 27,812
    Wolf, blackspire and superstar all do suitable single rings for the M9000.

    Just search (google, yahoo etc to preference) for 96BCD 38t - not hard dare I say it!
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • yroz
    yroz Posts: 4
    Thanks guys for the quick response. I did search the web. Most don't go over 36 or unavailable and Shimano seem to be making suitable rings . On the first reply -why should performance be affected by ramps and pins if I use a single chainring?
  • cooldad
    cooldad Posts: 32,599
    They are there to help the chain come off the ring. Which you don't want with a single.

    It will still work, just not optimally.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • The Rookie
    The Rookie Posts: 27,812
    And you will absolutely need a chain guide.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • MRCMMC
    MRCMMC Posts: 3
    Wolf Tooth are great, I have two. No dropped chains thus far....
  • njee20
    njee20 Posts: 9,613
    Don't go bigger than 36t though.

    Do you definitely want bigger OP?! That'll be pretty stiff gearing.
  • yroz
    yroz Posts: 4
    I know going over 36t is against current CW. However, I ride long distance xc only (mostly hard pack with some road) and have a lot more strength than speed - I can work hard for a long time, but not very fast. Another plus of going for a bigger ring is that I will spend less time grinding my 11t sprocket ring. BTW - on my previous bike (29" carbon HT like the current ones) I had a 42t on a triple and later 40t on a double crankset (both SLX) - and it was just fine.
  • njee20
    njee20 Posts: 9,613
    Well... Yeah, but that's a double. I ran a 32/44 double for years, but I'd not go for a 44t single.

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