ZTTO Bicycle Headset ZS44 EC44 CNC 11/8"-11/2" Cone Tube Front Fork1. Material: aluminum alloy + bearing 2. Applicable frame: The upper inner diameter of the head tube is 44 mm, and the lower inner diameter is 44 mm 3. Front fork: standard vertebral canal front fork, upper 28. 6mm, lower 39. 8mm 4. Heat treated high strength aluminum alloy material, high quality CNC machining, light weight but high strength 5. High quality double sealed bearing structure, smoother and quieter than steel ball bearings 6. The rubber
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