Annoyingly, it appears the MTB version of GPX comes with spacers that could be moved around http://www.sram.com/sites/default/files/techdocs/95-6115-006-000_rev_e_mtb_cranksets.pdf but the road version doesn't http://www.sram.com/sites/default/files/techdocs/95-6115-007-000%20Rev%20A%20-%20Road%20Cranksets_3.pdf
Same with Shimano Hollowtech BBs. mtb have spacer and longer axle, road have short axle (which can still take a little spacing) and no spacer as stock.
@M_V started
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Same with Shimano Hollowtech BBs. mtb have spacer and longer axle, road have short axle (which can still take a little spacing) and no spacer as stock.