ROTOR Round Chainrings 12-11sp (BCD110x4) ROTOR Round Rings BCD110x4 chainrings compatible with all ROTOR cranks using BCD 110×4 spider or INspider power meter. In addition, these chainrings are also compatible with Shimano® Ultegra® FC-8100, Ultegra® FC-8000, Dura-Ace® FC-9200 and Dura-Ace® FC-9100 cranks cranks, offering fast and precise shifting while maintaining a very low weight. Aero-chainrings are not compatible with the 12-speed Shimano® Powermeter cranks. ( R8100p and R9200p ) Characteristics Sizes Outer: 58 aero | 56 aero | 55 aero | 54(42) aero | 54(42) | 54(39) | 53 | 52 | 50 | 46 Sizes Inner: 44 | 42 | 39 | 36 | 34 BCD: 110×4 Weight: 103.5 g (50T) Chainline: 43.5 mm (using standard axle), 46 mm (using offset axle) Material: 7075-T6 aluminum alloy 100% CNC-machined Cranks compatible NON-AERO: All ROTOR cranks using spider BCD 110×4. All ROTOR cranks using INspider power meter. Shimano® 2×12 and 2×11 cranksets and powermeters. Cranks compatible AERO: All ROTOR cranks using spider BCD 110×4. All ROTOR cranks using INspider power meter. Shimano® 2×12 and 2×11 cranksets BUT NOT compatible with Shimano® powermeters! Groupsets compatible: Shimano® 11s & 12s Chains compatible: 11s / 12s chains
