At 18-in this is the largest size in the range, suited to riders 47 to 59 in tall with a 21.5 to 25.5 in inseam, which usually means a 4 to 8 year old. The saddle climbs from 24 to 28 in and the handlebar follows, so the fit holds through a couple of growth spurts. A kickstand comes fitted on this size, letting the bike stand on its own instead of leaning against a wall. Pneumatic tires smooth out rough pavement, a hand lever and coaster brake share stopping, and the bike arrives 95 percent assembled. Seat rated to 99 lbs CPSIA certified.