wolf tooth powertrac asymmetric 4 x 110 bcd The Wolf Tooth Powertrac Chainring works with your biomechanics to achieve optimal efficiency and power with every pedal stroke. Not only will you gain more power, but you will also benefit from greater traction, and less shifting. Wolf Tooth's proprietary design is less ovalized than its competitors, eliminating the funky, uneven pedaling sensation while delivering the optimum pedal stroke. Just like Wolf Tooth's other single speed chainrings, the Powertrac features Drop-Stop tooth profile that holds chain snugly to the chainring. Wolf Tooth offers Power Trac Elliptical rings in a wide variety of sizes to fit all major brands' cranks. Just pick your size and configuration, order, install, and start pedaling as normal - your new oval rings will do the rest! Features Elliptical design improves power and efficiency Drop-Stop chain retention Available in assorted sizes and colors No funky elliptical pedaling sensation Compatible with Shimano 110 BCD, 4 bolt Asymmetric pattern | Wolf Tooth Components | Oval 110 Bcd Asymmetric 4-Bolt For Shimano Cranks 40T Asymetric For Shimano 4X110Bcd Cranks | Aluminum