Biocentric 30

The Niner BioCentric 30 has a similar design and function as its predecessor, BioCentric II, but is designed for use in most PF30 shells. It makes adjustments easy across a wide range of gears and eliminates the need for adjustable dropouts, giving the cleanest possible solution for single speed use. No bolt on hubs, no chain tensioners cluttering your ride, no brake adjustments with gear changes.

Greater Range

The BioCentric 30 offsets the bottom bracket spindle 8.5mm from center, offering greater range of adjustment compared to more traditional EBB setups. More offset when changing gears without having to change chain length allows riders to make more noticeable changes to frame geometry via BB position.

Reliable Function

Traditional EBB units are held in place with set screws that can become difficult to finely adjust over time, or expansion wedges that can deform the bottom bracket shell of the frame. Split BB shells that clamp an EBB can stretch or ovalize. The BioCentric 30 avoids these troubles by using two bolts to apply a clamping force on the outside edges of the BB shell, eliminating the possibility of ovalizing or indexing the shell itself.

The sealed bottom bracket is integrated into the cups of the BioCentric 30 and is compatible with most 24mm cranks. A reducer is provided for GXP cranks. Secure, quiet, easy to install and adjust, the BioCentric 30 will change your ideas about single speed drivetrain setup and maintenance.