Ceramicspeed bottom bracket t47a 30mm gravel

T47a for 77mm asymmetrical shell.

T47a is a threaded bottom bracket shell design, utilizing the oversized interface of BB right, but with the benefit and peace of mind of a threaded interface. Compatible frames feature an asymmetrical 77mm shell width, placing the non-drive side bearing within the frame, and the drive side bearing externally.

Our Gravel bottom brackets are built with CeramicSpeed Coated bearings and equipped with UFO Long Life Grease for the ultimate in durability and protection in all environments.

Equipped with precision dust covers for a snug & secure fit that also fully protects the face of the bearing delivers exceptional performance without any sacrifices. CeramicSpeed hand-built bearings carry the load from crank to frame with un-paralleled durability & efficiency.

Bottom Bracket tool for installation: CeramicSpeed Dual Socket Tool T45/T47 16-notch 52,2mm cup tool diameter

In The Box

2 cups with CeramicSpeed bearings and dust covers
2-part spacer tube
CeramicSpeed Long Life Grease
Spacers for setup & adjustments
Sticker sheet

Technical Data

T47a is an open standard designed to provide the benefits of both oversized shells and the tight fit of threading. These cups and bearings adapt the shell so it is compatible with 24mm diameter spindle cranks.

Our CeramicSpeed Coated Bearings reduce drag by over 75% when compared to stock bottom brackets. Down to 0.3-0.4 watts per set. This is the result of hardened-steel races, coated with a unique non-corrosive surface finish and combined with CeramicSpeed Balls that are 100% smoother and 15% harder than the ceramic competition, in addition to lasting longer.