Chris King® THREADFIT™ 30 Bottom BracketBuilt on the familiar BSA threading, the ThreadFit 30 is reliable. A silky smooth, long lasting bottom bracket built around our angular contact bearings that wear in instead of out. The ThreadFit30 is made for 30mm spindles. Fully serviceable and backed by our lifetime king warranty, this bottom bracket will outlast your bike. Built to ultra tight aerospace tolerances we use machined Delrin spindle sleeves to create a perfect, and precise, fit between