Our one wheel bike's specification is as following: Model No.:YDWB- features: 1) material:steel frame material:steel rim material:steel(aluminum is available) 2)Fork:clamp type,electro-plated or painted finished. 3)hub:electro-plated,painted finish,or ball bearing 4)crank:electro-plated steel 5)pedal:3x3/4" in lenth,steel+ABS 6)tyre:16",18",20",rubber in black or color one 7)saddle:leather with spring 8)seat post:16cm with electro-plated finish 9)seat post clamp:chrome steel quick release clamp ,getting the seat height just right. 10)seat saddle:PU seat with moulded foam upper and plastic bumper at both front and back. 11)tyre:black or colorful 12)Max loading:90kgs 13)package:1pc/carton 14)carton size: