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With the Excentriker we have another nice innovation part for your bike. A excentric bottom bracket for standard frames! Fix to standard frames and brings the possibility to adjust the chain tension (for gear hubs and single speed). So you don't need a chain tensioner, adjustable drop outs or tandem bottom bracket any more. The Excentriker is easy to install and brings you a smooth optic on your bike! Fits with single speed cranks with 24mm axle (Hollowtech II stand.).