The Legion L16 is a great first BMX bike for young riders that features the geometry and feel preferred by today s riders; Suggested rider height is 3'6" and smaller The Legion L18 features a durable Hi-Ten steel frame with 16.9" top tube length Drivetrain features a 140 mm one-piece crank with a 25T alloy chainring and American loose ball bottom bracket 18 x 2.3 tires mounted on aluminum single wall 28H rims with 3/8 in axle front hub and 9T cog ball bearing cassette rear hub Hi-Ten steel handlebar and fork, 40 mm stem, standard 1-1/8 headset, and aluminum U-brake