Scott Scale 400 is built around a "light is right" philosophy, swapping the heavy coil forks usually found on kids' bikes for a sleek, rigid setup. Designed for young riders starting around 125 cm tall, this bike is the ultimate "first real mountain bike." By ditching the suspension, Scott has managed to keep the weight down to a remarkably nimble 9.8 kg, making it much easier for smaller riders to manhandle the bike over obstacles and stay at the front of the pack on family trail days.
The build is centered on a durable 6061 Alloy frame and a size-specific cockpit that features smaller diameter grips and reach-adjusted levers for maximum control. While it keeps things simple with an 8-speed drivetrain, it features a "big" wide-range cassette to ensure those first steep climbs don't turn into a hike-a-bike session. Safety is handled by legitimate hydraulic disc brakes, providing consistent, effortless stopping power that doesn't require a "death grip" to engage. Wrapped in fast-rolling 24-inch tires, the Scale 400 is less of a toy and more of a precision tool for the next generation of trail rippers.
Specification Breakdown
Frame: Scale 24 Rigid Junior, Alloy 6061 / Semi-Int. HT, SCOTT dropout / IS
Fork: Rigid Alloy / IS / 24" (Weight-optimized)
Handlebar: Junior Flat Bar / Alloy / 560mm (Small diameter for kid-specific grip)
Stem: Alloy 6061 / 1 1/8" / 31.8mm / 7° Rise
Seatpost: Alloy / 27.2x300mm
Saddle: Syncros Future Pro
Shifters: Shimano SL-RS45-8R, Revo Shifter (or Trigger, depending on regional variation)
Rear Derailleur: Shimano Altus / 8-Speed
Crankset: Prowheel / Alloy Crank 140mm / 32T w/ Chain Guard
Bottom Bracket: Feimin / BB68 / cartridge / square taper
Cassette: SunRace CSM55 / 8-Speed / 11-34T (Big cassette for climbing)
Chain: KMC Z8.3
Brakes: Tektro HD-M276 / Hydraulic Disc / Short Reach Lever, 160mm rotors
Rims: Alex LA-20 / 24H / Disc
Hubs: Front: Formula DC-140-F / QR | Rear: Formula DC-38-R / QR
Tires: Kenda K1227 Booster / 24x2.2" / 30TPI (Fast rolling)
Weight: 9.8 kg / 21.61 lbs
Key Technologies
Lightweight Rigid Build: By utilizing an alloy rigid fork instead of a cheap suspension unit, the bike sheds nearly 2 kg of weight. This makes the bike significantly more responsive and easier for a child to lift and maneuver.
Optimized Climbing Range: The 8-speed drivetrain features a "Mega-Range" style cassette, giving kids a much lower gear than typical junior bikes, specifically to help them conquer hills without getting discouraged.
Size-Specific Cockpit: Unlike adult bikes, the Scale 400 uses a smaller diameter handlebar and grips. This ensures small hands can wrap fully around the controls for a more secure and confident grip.
Junior Hydraulic Disc Brakes: These brakes are specifically tuned with shorter-reach levers and a different master cylinder ratio, allowing kids to generate full stopping power with just one or two fingers.