The Niner BioCentric 30 is a clean and simple way for riders with a Niner PF30 frame to run a singlespeed setup on their bike. The sealed bottom bracket uses angular contact bearings that are offset so that the cups can be rotated to take up any chain slack, eliminating the need for adjustable dropouts or finicky chain tensioners. And rather than relying on friction to hold it in place inside the frame's BB shell, the cups fasten together securely with two bolts. The BioCentric 30 fits most 24mm spindle cranksets, and will also work with GXP spindle cranksets using the included reducer.
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Niner BioCentric 30
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