The YikeBike can comfortably be ridden by anyone from 160cm to 195cm (5’3” to 6'5"). There is no need to adjust the seat because you do not pedal – your height relative to the seat is only important to how much your knees are bent when riding. The YikeBike can comfortably take a rider (and personal effects) weighing up to 100kg. Beyond this weight we do not warrant performance. Over time we may make different sized ones - particularly for children.