Rennen Aluminum Cassette Cog Gear Size:17T React faster out of the

React faster out of the gate with the FASTR REACT

plus plastic bumpers under the nose and tail to help protect against wear

This premium alloy is also super lightweight

GRIP-PODS (PATENT PENDING): Pressure-sensitive traction system featuring sticky bristle knobs encased within a recess enabling an ultra-low tread profile with traction coming alive through applied force

Volcano cones

Rennen Aluminum Cassette Cog Gear Size:17T React faster out of theRennen Aluminum Cassette Cog are manufactured with 7075 T6 Aluminum, stronger than the industry usual of 6061 Aluminum. Measuring in at only 3 16" so it won't rub your hubs, Rennen Cogs are also the one of the lightest cogs on the market, with the 16T coming in at only 17 grams! Available in a wide range of sizes for various speeds, Rennen Cogs are also Shimano Spline compatible and will work with 8 & 9 speed chains. WEIGHT 13T: 0. 35oz 10g 14T: 0.