• Made of quality acrylic+aluminum alloy+ceramic material, it's durable to use
• It makes crankshaft power transfer more direct, with better rigidity
• The sealing system is easy to maintain and completely noiseless for lubrication
• It is lightweight and compact, convenient to carry

Specification:

• Material: acrylic+aluminum alloy+ceramic bearing
• Inner diameter: 24mm or 22mmx24mm
• Applicable frame bottom bracket: 68-73mm