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Compatibility These rings are for use with Shimano 110 BCD Asymmetric 4-bolt cranks. Compatible with Dura Ace 9000, Ultegra 6800, 105 5800, Tiagra 4703 or 4700, Sora R3000 or R3030, and Claris R2000 or R2030 cranks. Sizes 40T and larger are compatible with Dura Ace 9100, Ultegra 8000, and 105 R7000 but a slight modification is required due to a change in the crank arm profile. The 38T chainring will not work for this modification. Click here to review the process for the modification, which takes about 5 minutes to perform. NOT compatible with Dura-Ace R9200 and Ultegra R8100 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. Wolf Tooth’s patented Drop-Stop® wide/narrow tooth profile for the ultimate chain retention and mud shedding ability If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter for better chain retention). Chainline - 47.5mm