Eurobike Surly Bikes Karate Monkey | Singletrack Magazine - Karate monkey bottom bracket
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What length bottom bracket (BB) spindle do we recommend for your new Surly? 73mm Surly BB shells: 1x1, Instigator, and Karate Monkey. of the bottom bracket (the part of the frame that houses the crank bearings). We probably don't have to tell you, but for off road riders the Karate Monkey is like.