<!--ProdInc[170090054]/Mall:[rei_US]--> Fits 110 BCD asymmetric 4-bolt Shimano cranks Patented wide/narrow chainring with Drop-Stop technology: the wide side of the tooth has max contact on the drive side, which spreads the load and improves chainring life The narrow side allows clearance for mud and debris, which reduces friction Alternating wide/narrow tooth pattern prevents chain derailment Mounts in the big ring position of the cranks but is offset inward for perfect chainline Chainline: 47.5 mm Stock 2x bolts will not work; you will need the Wolf Tooth 6 mm bolts (not included) If using a 9-speed drivetrain use a 10-speed chain?it fits tighter for better chain retention 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; 36T chainring is not compatible with these cranks Not compatible with Dura-Ace R9200, Ultegra R8100, and 105 R7100 cranks Size 42T and larger will work with the Dura Ace 9100 power meter Wolf Tooth Components recommends the use of a clutch style rear derailleur for the best chain security If you plan to ride in very muddy conditions, Wolf Tooth Components recommends a chain guide or chain keeper in addition to a clutch-type rear derailleur Without these precautions, you may experience chain drops or chain suckMade in USA. Technical specs <table border=1 cellpadding=5 style=''border-collapse: collapse;''><!--[--><tr class=''tech-specs__row'' data-v-fc44804c=''''><th class=''tech-specs__header'' data-v-fc44804c=''''>Best Use</th><td class=''tech-specs__cell'' data-v-fc44804c=''''><!--[--><p class=''tech-sp <a href=''https://www.rei.com/product/237345/wolf-tooth-components-110-bcd-asymmetric-4-bolt-chainring'' target=_blank><img src=''https://www.antpop.co.kr/antMain/AntImgView?CustID=jellymom2&MallKind=US&MallID=rei&ProdInc=170090054&MallIDEncodeYes=0&SiteName=PostSelf'' width=''100px'' height=''20px'' border=0></a>