T47a Shimano Road 
五通軸承 ( BB ALPHA )

A bottom bracket built to outlast your frame. BB ALPHA features hardened stainless-steel races hand-built with grade-3 Silicon Nitride ceramic balls, custom-engineered seals and precision dust covers, delivering up to 500% better moisture protection, while still providing ultra-low friction performance. The simplified spacer tube design and lighter cups ensure quick installation and a 10% weight reduction over previous generations. All CeramicSpeed BB ALPHA models are backed by a lifetime warranty.

Precisely pair a 24mm axle crank from Shimano or other brands with a threaded T47 frame that is asymmetric and 77mm wide by selecting this high quality bottom bracket from CeramicSpeed. 

In the box:

• BB ALPHA for T47a Shimano Road
• UFO All Round Grease 5 ml
• Decal