With our Riprock Coaster 16 riding gets boiled down to its simplest element—fun. And to make sure of it we designed the bike with tons of cool features that are easy for your little ones to use like a coaster brake for simple stopping wide 16x2.3" tires that increase stability and confidence and tough components that will stand up to years of abuse. It's the perfect bike for your little ripper to start getting out on the trail with—we just wish that we had one when we were kids. The A1 premium aluminum frame is lightweight and built to withstand the tough use by kids while the geometry features an ultra-low standover that makes it easy for your little ones to fit on and grow with the bike. Steel coaster brake is a reliable easy to use brake perfect for safe stops and awesome skids. 16x2.3" Rhythm Lite tires deliver tons of traction comfort stability and fun over all types of terrain. Frame Specialized A1 Premium Aluminum Fork Hi-Ten steel Handlebar BMX steel 10-degree backsweep 4-degree upsweep 115mm rise 520mm width 22.2mm Stem Die Cast Aluminum 37mm length 10 degree 22.2 clamp diameter Seatpost Steel 22.2mm Saddle Specialized Kids' Henge Pedals Nylon platform w/ reflectors Brakes Steel coaster brake Brake Levers N/a Chain KMC Z510 single-speed anti-drop 1/2"x1/8" Crankset Hi-Ten steel 89mm Bottom Bracket Feimin FP-B701 68MM Rims 16" alloy 16mm depth 21mm internal width 28h Front Hub Steel bolt-on 100mm spacing loose ball bearings 28h Rear Hub Coaster brake bolt-on loose ball bearings 110mm spacing 16T cog 28h Spokes Stainless 14g Front Tyre Rhythm Lite 30 TPI wire bead 16x2.3" Rear Tyre Rhythm Lite 30 TPI wire bead 16x2.3" Inner Tubes Schrader valve Weight 9.1kg 20 lb 1 oz