Threadfit™ 30Description ThreadFit 30 fits 30mm and DUB spindle cranks in BSA bottom bracket shells. The Chris King ThreadFit 30 bottom bracket is silky smooth and long lasting thanks to their legendary, angular contact bearings and the best in the industry. They actually get faster over time as their contact surfaces wear, because we build them to ultra tight aerospace tolerances, using machined, Delrin spindle sleeves to create a perfect, and precise fit between
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