Chris King&';s ThreadFit(TM) 24 bottom bracket 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. 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 prices