Training wheels detach when they are no longer needed, and both saddle and handlebar adjust as the rider grows - 17.5 to 19.5 in at the seat, matched to a 17 to 18.5 in inseam. This 12 in wheel size suits riders 31.5 to 41.3 in tall, roughly three to four years old, with the seat rated 110 lbs. The bike measures 34 in long and 27 in high across a 20 in handlebar, weighing 18.5 lbs - light enough for a child to pick up after a fall. A front basket carries whatever comes along for the ride. Assembly is required and a manual is included.