CNC Knurled Alloy Threaded Bike Bottom Bracket（BB）

34.99
  • CNC knurled outer body, tight frame fit to eliminate loose wobble
  • Double sealed bearings, waterproof & dustproof for rough off-road use
  • Standard threaded dimension, wide compatibility with most bicycle frames
  • Hollow lightweight construction, less pedaling resistance & better power transfer
  • Anti-rust matte metal finish, long service life in wet and muddy conditions
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          Description
          This bike bottom bracket is precision CNC machined from high-grade aviation aluminum alloy, with knurled anti-slip outer surface for tight clamping inside frame bottom bracket shell. Built-in double-side sealed precision rolling bearings effectively isolate dust, mud and rainwater, ensuring ultra-smooth crank rotation and reducing pedaling friction loss. Standard threaded interface matches most common threaded MTB, folding and urban bike frame shells. Hollow optimized structure balances lightweight and torsional strength, sandblasted metallic finish greatly improves corrosion and abrasion resistance, perfect for original crank replacement and cycling performance upgrade.