SRAM Rival1 Crankset 11 sp. 175mm 50T BCD:110mm GXP 68mm 45.5mm BlackSRAM Rival 1 Crankset 175mm 10 11 Speed 50t 110 BCD GXP Spindle Interface Black. Featuring forged aluminum arms and SRAMs game changing X Sync chainrings this crankset hits the sweet spot between weight durability and performance. X SYNC Chainrings are compatible with SRAM 11 and 10 speed chains 45. 5mm chainline is compatible with130 or 135mm spaced rear dropouts Chainring spider is removable Q factor for GXP cranks is 149. 6mm Q factor for BB30 is