UN54 taper to Octalink

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dawh00
Posts: 10
Joined: Sun Aug 29, 2010 14:35 pm

UN54 taper to Octalink

Postby dawh00 » Thu Jan 03, 2013 20:09 pm

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

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The Rookie
Posts: 23069
Joined: Thu Apr 30, 2009 09:29 am

Re: UN54 taper to Octalink

Postby The Rookie » Thu Jan 03, 2013 20:20 pm

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!

dawh00
Posts: 10
Joined: Sun Aug 29, 2010 14:35 pm

Re: UN54 taper to Octalink

Postby dawh00 » Thu Jan 03, 2013 20:23 pm

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..

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nicklouse
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Re: UN54 taper to Octalink

Postby nicklouse » Thu Jan 03, 2013 20:26 pm

Shimanos tech docs will give the axle length you need for those cranks.

Don't guess look it up.
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dawh00
Posts: 10
Joined: Sun Aug 29, 2010 14:35 pm

Re: UN54 taper to Octalink

Postby dawh00 » Thu Jan 03, 2013 20:33 pm

Good shout. 113 or 118 it is.


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