UN54 taper to Octalink

dawh00
dawh00 Posts: 13
edited January 2013 in MTB workshop & tech
Hello everybody,

I'm changing my bottom bracket and chain set from tapered un54 to Octalink. The un54 is 73mm by 110mm. The closest Octalink I can find is 113mm.

Will this matter?

Thanks in advance

David.

Ps, I have a 99 rockhopper a1comp fs and I'm changing to an xt m751 chainset

Comments

  • The Rookie
    The Rookie Posts: 27,812
    Axle length depends on what the chainset needs for the same chainline, so measure the chainline on the ST and then find out what length axle the cranks need to get the same chainline.

    What cranks do you have now? Probably not Shimano at a guess!
    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.
  • dawh00
    dawh00 Posts: 13
    No, the original specialised forearm. Got the xt off eBay bit of a bargain.

    At worst I think its a3mm offset, at least I hope..
  • nicklouse
    nicklouse Posts: 50,675
    Shimanos tech docs will give the axle length you need for those cranks.

    Don't guess look it up.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • dawh00
    dawh00 Posts: 13
    Good shout. 113 or 118 it is.

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