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1. Aluminum Alloy: The aluminum alloy bottom bracket is made of aluminum alloy material, which is sturdy and durable.
2. Silicone Sealing Ring: A double silicone sealing ring is installed at the port at the bottom of the bracket.
3. Long Service Life: Prevent pollution, prolong service life, and easy to install, alloy material, durable and long service life.
4. Protect the Frame: The threaded system can protect the frame and output more power, better than the ordinary structure.
5. Specifications: The outer diameter of the bicycle bottom bracket is 47mm, the inner diameter is 30mm, five way for built in 86/92mm.

Specification:
Item Type: Bicycle Bottom Bracket
Material: Aluminum Alloy
Outer Diameter: Approx. 47mm / 1.85in
Inner Diameter: Approx. 30mm / 1.18in
Five Way: Built in Approx. 86/92mm

Package List:
1 x Bicycle Bottom Bracket