[Flower drum] Ultra-light carbon fiber tube. Bearings: 2 bearings for the front wheel, 5 bearings for the rear wheel.[Rim] Front 16 holes rear 21 holes, 30MM frame height aluminum alloy rim, outer width 19.5mm inner width 13.5mm. [Size] support tire size 23C-25C-28C. [Taki] 120-six reinforced six-ratchet aluminum tower (Shim ano), supporting 8-9-10-11 speed. [Spokes] Taiwan Xinda Straight Pull Wind (flat bar) + Xie Da self-locking anti-fall cap. [Number] front wheelset16holes rear wheelset21holes (2: 1 method). [Weight] 1950g / pair 900g for front wheels +1050g for rear wheels (weight does not include tire pads and quick release).