Sram Rival Chainset OCT Inc GXP BB 172.5 53/39
- Rival Chainset OCT Inc GXP BB The SRAM Rival Open Core Technology (OCT) Crankset shows the way forward for any serious cyclist, putting power to the road while saving weight at the same time. Open Core Technology means the crank arms are hollow-forged out of AL-6066 alloy for maximum strength & mount our Power Glide TM 10 speed chainrings.