Race Face X-Type bottom bracket with 3 x 2.5mm spacers weighs 116g.
Like all cranks, you get a bit of rock rash on the ends:
Related articles:
Q-factors for various cranksets
This is a list I have pieced together from various articles and postings on the internet.
Shimano XTR M9000 Race Brakes
Weights
Shimano XT 165mm crankset
Quick facts:
Rockshox SID Race Service
This little FAQ is in relation to my 2009 SID Race but is probably applicable to other 2009/2010 and later SID models. Just make sure you check the oil quantities for your particular fork.
Xtension Xpilot XC Frame
This is a relatively light cross country frame with 4 inches of rear travel (about 100mm) using a Horst link (pivots on the chainstays).