Chris King ThreadFit T47A 30 Bottom Bracket

The Chris King ThreadFit T47A 30 Bottom Bracket is a threaded T47 bottom bracket for T47 BB-Right shells and cranks with a 30mm spindle. T47 is a standard Chris King helped develop, intended as an answer to the imprecise and often loud press-fit bottom brackets that appeared in recent years. It offers the larger shell diameter of a press-fit design, which Chris King ties to frame stiffness, along with the precision and quiet running of a traditional threaded bottom bracket.

The bearings are what Chris King is known for. They are sealed angular-contact bearings designed and built in-house in Portland, Oregon, and each one is inspected and assembled by hand. Unlike common radial bearings, they can be adjusted as they are used, so Chris King says they wear in rather than wear out. Steel and ceramic versions are available. When the time comes, the bearings are user-serviceable without special tools: remove the snap ring and seal, clean, and re-grease. The cups install with Chris King's bottom bracket cup tool.

A Fit Kit is required to match the bottom bracket to your crank, and Chris King includes it in the purchase price. The T47A 30 is offered in a range of anodized colors, from Silver and Black to Matte Jade and Midnight, and it carries Chris King's Lifetime Warranty. Chris King says its bottom brackets are built to order, with lead times usually running 2 to 7 business days. If you want a quiet, serviceable bottom bracket for a T47 frame with a 30mm spindle crank, this is a straightforward fit.