ThreadFit(TM) T47 Bottom Bracket is the solution. A silky smooth, long-lasting bottom bracket built around our angular contact bearings that wear in instead of out. ThreadFit(TM) T47 provides the security and reliability of a threaded bottom bracket with the stiffness and power transfer gains of a PressFit 30 bottom bracket shell. ThreadFit(TM) T47 30x fits 68mm and 73mm shell widths with 30mm spindles. - King Lifetime Warranty - Legendary made-in-house bearings - Ceramic bearing upgrade available - Threaded security with PressFit 30 shell stiffness - A Fit Kit is required for use - Engineered, manufactured and assembled in Portland, Oregon USA - Uses Chris King bottom bracket cup tool for installation