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Chainring compatibility-double rings on a triple crank

bails87bails87 Posts: 12,998
edited February 2013 in MTB workshop & tech
I've got an m660 SLX crankset, currently set up as a 2x9 double. I'll be changing to a 2x10 setup at some point in the near future. I've got all the bits I need apart from chainrings, obviously it's cheaper to get rings then a replacement slx crank set.

When I do change, can I use 10 speed chainrings intended for one of the shimano doubles? Is there any issue with putting double rings on a triple crank, or is it just a case of getting anything with the same BCD and the right number of speeds.

Would fitting a bash ring make any difference?

Cheers
MTB/CX

"As I said last time, it won't happen again."

Posts

  • The RookieThe Rookie Posts: 27,802
    Nominally 9 and 10 are different, in reality no-one has ever been able to really define what they are, many people are running 10 speed rear with 9 front (cranks and/or rings) without issue. Yes you can fit double rings to a treble, either with a bash or without, you just need the right ring bolts for the assembled thickness.
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
  • bails87bails87 Posts: 12,998
    Cheers, just wanted to check there wasn't anything odd about them.

    Yeah, I'm currently running an 8 speed chainrings and a 10 speed front mech with no issues. Just hope I can find some rings that aren't extortionate!
    MTB/CX

    "As I said last time, it won't happen again."
  • The RookieThe Rookie Posts: 27,802
    What sizes are you planning? I have an Shimano SG-X 28T inner surplus to requirements...
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
  • njee20njee20 Posts: 9,613
    As above, in reality they're similar enough that there's no difference, I'd just keep what you have unless you want drastically different ratios.
  • bails87bails87 Posts: 12,998
    Currently on 24/38 which I'm happy to stick with. I doubt the inner is very worn and the middle/outer is steel so that'll last forever, it was the '10 speed chain on an 8 speed ring' that was making me think I'd have to get a new ring. If it'll work then I'll happily leave it.
    MTB/CX

    "As I said last time, it won't happen again."
  • The RookieThe Rookie Posts: 27,802
    It'll work fine, leave it!
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
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