Rennen Aluminum Cassette Cog Gear Size:17T plus plastic bumpers under the

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

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React faster out of the gate with the FASTR REACT

CRANK REQUIREMENT: Any crank with 4-Bolt spider or that can be adapted with a 4-bolt spider

Rennen Aluminum Cassette Cog Gear Size:17T plus plastic bumpers under 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.