18KG bi-directional inertia wheel; chain drive system; fashion dynamic shape design; handlebar armrest height adjustable system; saddle height, the level of adjustable system; Stepless resistance adjustment, Jicha devices; Carton size: 1120 * 520 * 880MM ; Gross weight: 57KG; NW: 52KG; Expand Size: 1300 * 530 * 1180MM