Kids' Bike · 20" or 24" Developed with Marin Bikes Japan (yes, the CEO is a legendary BMX flatland rider nicknamed "Donky"), the Donky Jr. is designed from the ground up for young riders. Lightweight aluminum frame, steel fork, freewheels and handbrakes to help them transition to bigger bikes as they grow. Smooth-tread tires roll efficiently, strong linear-pull brakes stop on the proverbial dime, and real kid ergonomics (short-reach levers, integrated saddle/post) make it welcoming. 20" available in single-speed or 6-speed configurations; 24" comes with Shimano Tourney 6-speed. At a Glance Frame: Series 1 Aluminum, 20" or 24" Wheels, Replaceable Derailleur Hanger, Rim Brake Fork: Steel Blade, Rim Brake Brakes: Linear Pull (V-brake) Alloy, Kids' Short-Reach Levers Rims: Aluminum, CNC Brake Surface Tires: Marin/Vee Tire Speedster, 20x2.0" or 24x2.0" Full Specifications Frame Series 1 Aluminum, 20" or 24" Wheels, Replaceable Derailleur Hanger, Rim Brake Fork Steel Blade, Rim Brake Drivetrain (24") Shimano Tourney 6-Speed w/ Revoshift twist Drivetrain (20") Single-speed or 6-speed (varies) Crankset (24") Forged Alloy, 32T, 152mm, Ring Guard Crankset (20") Forged Alloy, 32T, 140mm, Ring Guard Brakes Linear Pull (V-brake) Alloy, Kids' Short-Reach Levers Rims Aluminum, CNC Brake Surface Tires Marin/Vee Tire Speedster, 20x2.0" or 24x2.0" Saddle Integrated Saddle/Seatpost unit