Built on the familiar BSA threading, the ThreadFit(TM) 30 is reliable. A silky smooth, long-lasting bottom bracket built around Chris King&';s angular contact bearings that wear in instead of out. The ThreadFit(TM)30 is made for 30mm spindles. Fully serviceable and backed by Chris King&';s 5-year built-to-last 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 cranks and frame, providing ultra-low drag, and a butter-smooth feel. Our ThreadFit(TM)30 is ready for a wide selection of cranks. Engineered, manufactured and assembled in Portland, Oregon USA King Lifetime Warranty Legendary made-in-house bearings Available in 9 beautifully anodized colors A Fit Kit is required for use and included in the purchase price Uses Chris King bottom bracket cup tool for installation