Ceramicspeed T47 30 Bottom Bracket Cup, Black

T47 is a standard created by custom frame builders in the United States.

It is threaded, has an internal diameter of 47 mm and 86 mm wide.

It has the design benefits of being oversized and wide, but also the practical benefits of threads.

This kit combines those bb with 30mm cranks.

The cups have pressed CeramicSpeed bearings.

There are two bearing options.

The standard bearing has ceramic speed balls and hardened steel tracks.

Coating Bearing has the same balls that run in a 3 micron thick coating placed on top of hardened steel tracks for durability and even less friction.

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