Used for 200 km. ONLY for Sram cranks that have 1 hidden chainring bolt behind the crank arm: Sram Red, Red eTap, Red22, Force1, Force22, Rival, Rival1. Compatible with Quarq. For Apex cranks - please navigate to our standard 110/5 rings. BOLTS Reuse original Sram bolts except the hidden bolt. AB Outer chainring comes with the hidden bolt in the packageIf changing inner chainring only - reuse all original bolts. Material & Finish cnc machined 7075 Txxx Aluminum. Long-lasting construction. Type II anodizing Ovality Optimized to each size separately. 34T- 6.5% ; 36T- 11.4%, 50/52 - 10.3% ; T...