Heres some pictured from when i dismantled the GXP/BBright setup, and repaced the BB and reinstalled the BB30 Quarq.
GXP-BBright Setup Chainline:
Chainstay to Big ring measurment GXP - BBright Setup
approximately 14mm (looks 15 but thats the camera angle and bad picture...
Picture of non drive side (NDS)
Note Cup looks like it is not pressed in far enough. This is because constant tightening of the crank pulled the NDS cup into the frame, flaring the outer shelf of the cup. It was removed and using loctite 609, pressed back into correct position, but the flaring of the outer shelf remained.
Amount of exposed crank shaft on NDS = approx 10mm
Drive side of crank, with 2mm spacer between crank and BBright adaptor (plus lots of grime!)
BBright adaptor with 2mm spacer
Drive side BBcup, and bearing cover & Quarq magnet
GXP - BBright Adaptor reinstalled WITHOUT 2mm spacer
Distance between Chainstay and big ring now 12 to 13mm (ie much more inward as u would expect)
GXP-BBright adaptor WITHOUT spacer - crank rubing on quarq magnet and Drive side cup
Chainline with GXP-BBright adaptor WITHOUT spacer
ORIGINAL BBright FSA Crank
Distance from chainstay to big ring - approx 14mm (apologies for bad pic)
ORIGINAL BBright FSA Crank - NDS shaft 15mm
BB30 Quarq Setup:
Drive side with 12mm color insitu
BB30 Quarq Setup: chainstay to big ring distance 14mm