- The Niner EBB is designed for use with external bearing cranksets only
The Bio-Centric EBB is only designed to fit in Niner frames. It can sometimes be made to fit into other manufacturer’s frames but it will not work properly. The Bio-Centric clamps to the outside face of the EBB shell and because of that it requires that the EBB shell be precisely faced. This facing is something that can only be done at a machine shop, or in the case of Niner frames, at the time of manufacture.
Some older Niner frames may require extra steps for installation. If you have a used/older frame or if your EBB has 130 in/lbs laser etched on the non-drive side shell, contact info@ninerbikes.com for instructions.