Optimized for riders with leg lengths between 74cm and 84cm (we recommend you use your existing unicycle when checking this dimension) Optimized leg length: Frame Size --- Leg Length-- 200mm -- 25" to 29" (64 - 74cm) 300mm -- 29" to 33" (74 - 84cm) 400mm -- 33" to 37" (84 - 94cm) Saddle: Nimbus Flat with front lift handle Seat post: Nimbus 25.4mm x 200mm (black) aluminum with a welded rectangular mounting bracket, 4 hole Seat post clamp: Nimbus 30.5mm (black) double bolt, aluminum Frame: Nimbus Equinox 20" (black) 100mm spaced (300mm Longneck) 7000 series aluminum with 42mm machined maincap bearing housings Hub/axle: Nimbus ISIS (black) 36H, hardened CrMo splindle,100 mm center bearing to center bearing Spokes: 14G. stainless black (167mm in length for 3X) with brass silver nipples Rim: Nimbus Dominator 19" (black) 36H, 42mm wide, doublewall, reinforced eyelets, aluminum Rim strip: Rubber Tube size: 20" x 1.95 - 2.125" Tire: Nimbus Cyko Lite 19 x 2.5. This is a specific tire for this rim. A regular 20" tire cannot fit this rim. Crank arms: Nimbus Venture2 125mm (black) ISIS splined, aluminum Pedals: Nimbus Venture (black) reinforced plastic body, CrMo axle with 9/16 threads Bearings: 22mm x 42mm x 12mm Approx. cycle weight: 9.5 lbs.