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Bottom Bracket Help


By JimmyJazz - Posted on 20 July 2015

NB: Originally posted elsewhere on the Global Riders Network and appears via syndication.

So I've trawled the forums and I'm pretty sure I've complicated what seems to be a very simple question.....or the plethora of information and marketing hype on the topic has consumbed me.

Eitherway, hoping the trusty folk at NOBMOB can give me a straight answer;

Simply, can I swap out a BB71 bottom bracket for a GXP compatible bottom bracket? And specifically, which GXP BB will fit a 2014 Trance 2 (if any).

Not so simply, I'm exploring options of upgrading the drive train on my 2014 Trance 2 to a 1x11 setup (not a hack job either, as ultimatley these parts will be swapped over to a better frame). I'm thinking SRAM X1, X0 or XX1, depending on what I can find reasonably priced, second hand.

Thanks in advance!

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With a bit of research it seems the BB71 is just the model number but the standard is actually BB91

There's a fair bit of info on this thread but it's not clear if you can use a GXP press fit BB or need to use adapters like the Hope ones

http://forums.mtbr.com/specialized/sram-xx-crank...

http://www.chainreactioncycles.com/au/en/hope-bo...

It would be a lot easier to put XT 1x11 on and you can use your existing BB

Hope that helps
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Shame the 1x11 still isn't available!

Shame the 1x11 still isn't available!

Yes jimmy, you can put a GPX pressfit in the frame that also takes a bb71

You cannot however use a pf30 BB.

On the crankset - you don't need to change the crankset to go 1x11 - most people keep whatever they have and change shifter, deraileur and cassette, and put a new NW chainring on. Shimano use 104bcd so you can put down to a 30t front ring on them.

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