BB MEROCA Bicycle Hollow Shaft Bottom Bracket -24BB MEROCA Bicycle Hollow Shaft Bottom Bracket 24 colors : red , black , purple , blue , green , gold "BB" is the colloquial name for a bicycle's bottom bracket, a part that connects the crank to the frame and allows the drivetrain to rotate smoothly. This term refers to a screw in type bottom bracket system, commonly found on traditional or affordable bicycles, as opposed to the more modern press fit system. Function of the bottom bracket (BB)

Specifications: 25

has diamond-like metal texture

Shaft diameter:φ24*φ24(22)

Hub Width (O

*Bearing: steel ball / hybrid ceramic bearing / ceramic Bearing

3D Forged Technology: Optimizes weight while ensuring maximum strength and load capacity

good choke

Here is the translated product description

Rear wire length: 2m1

Weight : 274gram

The shiny silver finish not only delivers a classic

*Shifting speed increased by 20%-26% for Shimano systems