Features: 1. Good Features: Aluminum alloy frame, smooth pedaling, reduced noise, light weight while maintaining high strength. 2. Integrated Sealed Bearings: Integrated sealed steel bearings Compatible with longer life. Preserves the lubricant in the bearing, good dustproof and waterproof effect, suitable Compatible with tough riding environments. 3. Stable Performance: Robust aluminum alloy Compatible with improves lateral stability, is not easy to loosen and rejects abnormal noise. 4. Precision Machining: The service life of precision machining increases and the bottom bracket's sealing performance is good. 5. Product Size: Inner diameter is 30 mm / 1.2 inch, outer diameter is 42 mm / 1.7 inch, applicable frame diameter is 46 mm / 1.8 inch, compatible frame bottom bracket width is 68 mm / 2.7 inch, 73 mm / 2.9 inch. Specification: Product Type: Bicycle Bottom Bracket Product Material: Aluminum alloy, sealed bearing, nylon Color: As pictures show Weight: Approx. 130 g / 4.6 oz Product Size: Inner Diameter: Approx 30 mm / 1.2 inch Outer Diameter: Approx 42 mm / 1.7 inch Applicable Frame Diameter: Approx 46 mm / 1.8 inch Compatible Frame, Bottom Bracket Width: Approx 68 mm / 2.7 inch, 73 mm / 2.9 inch Package List: 1 x Bottom Bracket 1 x Washer