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XTR (M975) kit on 2013 Giant Trance 29er 2 - rear Brake caliper not fitting?
NB: Originally posted elsewhere on the Global Riders Network and appears via syndication.
Hi all,
I recently bought a Giant Trance 29er (2) and a s/h XTR grouppo.
There were a few changes to be made (screw type bb vs press fit, etc).
But where I'm getting stuck big time is that the rear XTR (IS) caliper - even with an adapter - isn't getting anywhere near grabbing the disk?
The caliper needs to get closer to the frame, but all the adapters put the caliper further away?
Do I just need to buy a bigger rotor? Thanks 
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Photos?
Here is a fork adapter picture, if you install it upside down it would make the calliper move further away from the rotor. Hard to know without a picture of your bike.
https://encrypted-tbn1.gstatic.com/images?q=tbn:...
How did you convert the BB, I thought frames were press fit or threaded and not convertible?
So the obvious question apart from is it upside down, is it a 140mm rotor? Coz the answer to that is yes you need a bigger rotor, but a trance should take a 160mm rotor direct mount (no adaptor)on the rear and 180 with a 20mm mount.
Mounts are a bits of a pain, handy to have 2 or 3 different styles to get a good fit and more than a couple of little washers to get things happening
Oh and if its an old xtr with side mount for the brakes, then you need a side mount adaptor and the minimum is therefore a 180mm rotor IIRC