ThreadFit™ 30 bottom bracket is designed and built to bedurable, serviceable, and silent. Manufactured to create a precise andfunctional interface between your frame’s bottom bracket shell and yourcranks to ensure that your cranks will spin lightly and withoutinterference. King has has developed a range of conversion kits (search bar for conversion kit) that allowour ThreadFit™ 24 to be used with a wide selection of road and mountainbike cranks.