We make bearings, so we build bottom brackets. The humble threaded bottom bracket is often the first part installed on a new frame, and the last thing the cyclist thinks about during the life of the bike, but the bottom bracket has a direct effect on pedalling efficiency (read: speed). This is where you put your power into the bike. Having the best interface between your effort and your bike's momentum improves your ride. The Threadfit™ 30 is how we make bikes equipped with 30 mm cranks in the best possible way.

ThreadFit™ 30 fits 30 mm spindle and DUB cranks in BSA bottom bracket shells.

Our ThreadFit™ 30 bottom bracket is silky smooth and durable thanks to our legendary angular contact bearings, in steel and ceramic, the best in the industry. In fact, they become faster over time as their contact surfaces wear in, because we build them to ultra-tight aerospace tolerances, using machined Delrin spindle sleeves to create a perfect and precise fit between the cranks and the frame. This is where the low drag and butter-smooth feel come from.

You want this bottom bracket because it offers very low drag. You want this bottom bracket because it can be opened, cleaned and repacked for years of faithful service. You want this bottom bracket because you don't want to think too much about your bottom bracket.

Our Threadfit™ 30 bottom brackets are available in a range of beautifully anodised colours and each includes a fit kit that allows it to be used with a wide selection of road and MTB bike cranks.

The fit kit for our ThreadFit™ 30 with 30 mm spindle cranks is available here. The Fit Kit for DUB cranks is available here.

ThreadFit 30 comes with a centre sleeve for 73 mm BB shell. For a 68 mm shell, a PBB082 sleeve is required (included in fit kit #2 for DUB Road cranks).

Designed, manufactured and assembled in Portland, Oregon, USA

King lifetime warranty

Legendary in-house manufactured bearings

Available in 8 beautifully anodised colours

A fit kit is required for use and included in the purchase price

Ceramic bearing upgrade available

Uses the Chris King bottom bracket cup tool for installation