What is an acceptable difference in distance between the drive and non-drive crank arm end to the seat post tube for a SRAM crank/GXP bottom bracket? As an example: the drive side arm 1mm greater than the non-drive side.
I've been able to reduce the distance difference on tapered square spindles with temperature treatments, and reduced the difference by .5mm on a GXP with a few hammer taps, just wondering what's an acceptable tolerance. This is with proper frame BB shell preparation and road double crankset.
I'm with the OP, but then I'm a tad anal about symmetry. Chainline doesn't count for a whole lot on multispeed drivetrains, particularly if the study I saw cited in another thread saying there's no loss in efficiency across a whole 9spd cassette is to be believed.