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GXP cranks - in my experience - can only be adjusted with spacers on the NDS to pull the DS inboard. Spacers on the DS, beyond taking up any space between the shield and the crank spider*, cause the NDS arm to bind the NDS bearing.
* space, not slop, because GXP cranks when installed properly have no slop regardless of shell tolerances. The whole point of GXP is that the crank bolt is only used to attach the NDS arm to the axle, and plays no part in bearing pre-load or removal of horizontal slop.
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You can use spacers to adjust the chainline with those crankset no problem
This is wrong. There might be a small amount of wiggle room, but it's so small that it's not worth trying to use it, because chainline offsets that small aren't worth worrying about.
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Howard
gbj_tester
@santino
You can use spacers to adjust the chainline with those crankset no problem. But indeed you have to tighten it only to the point the crankset stop any horizontal play (as specified in the SRAM manual you get with it new). More and you crush it as howard explain.
There is a tolerance build in the crankset for the bearings to seat in a wider area than necessary so few mm spacers can't do any damage. Remember that chainline is being adjusted with spacers on the non drive side to pull the crankset toward the frame.