Wolf Tooth Elliptical Shimano 110 Asymmetric BCD Chainring - 42t For Shiman - Designed to fit Shimano GRX 4-bolt 110 Asymmetric BCD cranksets. The design has an ovality of 10% and a timing of 112 degrees after top dead center which provide the beneifits of an oval ring such as greater rear wheel traction without the traditional downsides of oval rings. These rings feature Wolf Tooth's Drop-Stop asymmetrical tooth design for the best in wear life, mud clearance, and chain retention.Compatible with all 10-, 11-, and 12-speed chains, with the exception of Shimano 12-speed chainsCompatible with Shimano GRX cranksets including RX600 and RX810Drop-Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrainsIf using a 9-speed drivetrain, use a 10-speed chain, which will provide a tighter fit for better chain retentionMade from 7075-T6 aluminum for long lifeShimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainringsThe Powertrac elliptical design means the diameter is that of a chainring 2t biggerUse of a clutch-style rear derailleur is recommended