Wolf Tooth Elliptical Shimano 110 Asymmetric BCD Chainring - 42t 110 Asymmetric BCD 4-Bolt Drop-Stop For Shimano Cranks Black. Designed to fit 4-arm 110 Asymmetric BCD Shimano Road Cranksets. Its proprietary 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 the patent pending Drop-Stop asymmetrical tooth design for the best in wear life mud clearance and chain retention.

The simplest way to explain the way these rings feel is having 2 teeth less in the weak part of your pedal stroke and 2 teeth more where you have the most power

Features Wolf Tooth's Drop-Stop tooth design for maximum chain retention

Drop-Stop chainrings are designed for use with 1x9 1x10 1x11 and 1x12 drivetrains

Compatible with all 10- 11- and 12-speed chains with the exception of Shimano 12-speed chains

Shimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainrings

If using a 9-speed drivetrain use a 10-speed chain which will provide a tighter fit for better chain retention

Made from 7075-T6 aluminum for long life

Use of a clutch-style rear derailleur is recommended