Check the listing for details. Aluminum Single Speed Cog. Condition: New. Listed at 34.97 USD. These aluminum single speed cogs feature extra tall teeth for reliable chain retention when using chain tensioners. They are reversible and feature a 4.5 mm width at the base that won't dig into your freehub body. Compatibility These will fit on Shimano Hyperglide style freehub spline (geared or single speed). Not compatible with Shimano Microspline or SRAM XD freehubs. Designed to work with any chain through 12-speed Tooth width optimized for 9,10, and 11-speed chains Not compatible with Campagnolo Ekar 13-speed chains Related products Our Drop-Stop® chainrings mate with these cogs for the ultimate singlespeed drivetrain For more durability, check out our Stainless Steel Single Speed cogs. Tech Specs Weight: 16T • 14.5g | 17T • 16.5g | 18T • 19g | 19T • 21g | 20T • 23.5g | 22T • 28g Material: 7075-T6 Aluminum Made in the USA [snippet name="Prop 65"] Patent and trademark information Listing and template services provided by inkFrog