104 BCD is the most common bolt pattern on double and triple cranksets and happens to be the first product ever made by Wolf Tooth Components. This chainring started it all for us. The Drop-Stop tooth design is the best performing and longest lasting wide/narrow chainrings on the market. - Fits any 104 BCD crankset - Drop-Stop technology. On Wolf Tooth's patented wide/narrow chainring, the wide side of the tooth has maximum 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 Compatibility - Fits any 104 BCD crankset - Designed to meet the requirements for E-bike use - Chainring Bolts: All tooth sizes require 1x bolts that are 6mm long with the exception of the 30T option, which is threaded and require bolts that are 7-10mm long. - 104 x 30T please use 10mm bolts - 104 x 32T use 6mm bolts - 32T 104BCD chainrings work on many older 2x Shimano cranksets (XT, SLX, Deore) - Both sizes of 104 BCD chainrings are compatible with QUARQ power meters - The Wolf Tooth 30T is the only 104 BCD chainring made in the market. Chainring is offset by 2mm - Drivetrains: 1x9, 1x10, 1x11 and 1x12 drivetrains