The Chris King ThreadFit 24 Bottom Bracket with steel bearings is designed and built to be durable, serviceable, and silent. Manufactured to create a precise and functional interface between your frame’s bottom bracket shell and your cranks to ensure that your cranks will spin lightly and without interference. Stock size is for a standard 24mm axle ( Shimano Standard) and a 68 - 73mm shell width. We stock a range of conversion kits that allow our ThreadFit™ 24 to be used with a wider selection of road and mountain bike cranksets and shell widths.  Chris King ThreadFit 24 Bottom Bracket Features Engineered, manufactured and assembled in Portland, Oregon USA 5-year built-to-last warranty Legendary made-in-house bearings Available in 9 beautifully anodized colors Responsibly lightweight Easily serviceable with our integrated grease injection system Find your fit with our required conversion kits