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Compatibility Fits 110 BCD asymmetric 4-bolt cranks All sizes compatible with Dura Ace 9000, Ultegra 6800, 105 5800, RS510, Tiagra 4700 or 4703, Sora R3000 or R3030, and Claris R2000 or R2030 cranks. 38-50t are compatible with 105 R7000, Ultegra R8000, and Dura-Ace R9100. The 36t chainring is NOT compatible with these cranks. NOT compatible with Dura-Ace R9200 and Ultegra R8100 Size 42t and larger will work with the Dura Ace 9100 power meter Mounts in the big ring position of the cranks but is offset inward for perfect chainline. The stock 2x bolts will not work. You will need our 6mm bolts which are optimized for single ring mounting. If using a 9-speed drivetrain use a 10-speed chain. It fits tighter for better chain retention Chainline 47.5mm Use Drop-Stop B for all 9, 10, and 11spd chains or 12spd SRAM Eagle, SRAM Flattop, Campagnolo, KMC, Connex or Wippermann chains