Cook Brothers Cranks

COOK BROS RACING RSR SERIES CRANK ARMS

The Cook Bros. Racing RSR cranks are similar in style to the Cooks CBR arms, (the same aluminum stock, 7075-T6) and are made using the same manufacturing techniques, however there are some important design differences. The arm dimension is slightly smaller in diameter, and they have a half-round shaped slot milled down the back of the arms. The milling is to create greater clearance for smaller chainrings, front derailleurs and generally to produce a lighter crank. The left arm of the CBR set, in a 176mm length, weighs 224.5 grams, while the 176mm RSR left arm weighs just 188.5 grams. The 176mm right arm of the CBR set weights 283 grams while the 176mm right arm of the RSR set weighs 248 grams.

The spider has been reworked, having all excess aluminum milled away to reduce any extra weight. This crankset is compatible with all 2 degree tapered bottom brackets, and uses the standard 74mm and 110mm bolt pattern. The crank arms are anodized in Blue, Black, Purple or Silver, with the spider anodized in Black, and come in 171mm, 176mm, or 181mm. We found the RSR cranks to have a Bike-Pro Q measurement of 167mm. Cooks RSR cranks come as right arm, with spider, left arm and a set of five steel inner chainring bolts with aluminum spacers. Chainrings, the double chainring bolt set, crank bolts and crank arm dust caps will be needed separately. The 176mm arm set, with spider, in Silver, weighs 436.5 grams. The inner bolt set provided weighs an additional 35 grams. Be sure to specify color and length.

	Size-71-76-81 / Color-B-BK-L-S  $ Price in Catalog



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