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Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
  • Cobalt Junior Complete Bike by Radio
Cobalt Junior Complete Bike by Radio
£535.00 GBP
Top Tube
Color
Highlights

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Product Details

Hook
Small frame. Big mission. The Cobalt Junior is built for young racers chasing real speed from day one.

Identity
This is Radio’s light, fast, progression-ready race machine for junior riders stepping into the track for the first time. At just 8kg, it’s one of the lightest entry-level junior race bikes out there. With sealed hubs, an integrated headset, proven geometry and components that punch way above the price—this is the bike built to help new racers break the gate and never look back.

Energy
Lean, sharp, unstoppable. The Cobalt Junior is racing DNA without the fluff.
Specifications

Highlights

Ultra-lightweight 6061-T6 alloy frame for fast acceleration

Full sealed front and rear hubs for smooth rolling and low maintenance

Integrated headset for clean, modern race setup

Forged alloy 3pc cranks for strength with minimal weight

Arisun XLR8 race tires for grip and speed

Race-proven geometry sized specifically for junior riders

Technical Specs

Frame: 6061-T6 alloy, forged dropouts, internal chain tensioner

Fork: Crmo fork, 1" butted steerer, hi-ten legs, 23mm offset

Handlebar: 4130 crmo seamless bar

Grips: Radio Raceline Cobalt, diamond knurled, 130mm

Stem: Radio Raceline Cobalt topload, 40mm, alloy

Headset: Radio Raceline integrated, sealed, 1"

Brake Lever: Promax XL-378, rear

Brake: Promax MV-87, rear

Cranks: Radio Raceline Cobalt 3pc forged alloy, 155mm

Bottom Bracket: BSA square taper, sealed

Pedals: Radio Raceline Cobalt Junior, nylon

Chain: KMC Z6, 1/2" x 3/32"

Sprocket: Radio Raceline, 40t alloy

Driver: ATA freewheel, 16t, crmo

Front Hub: Radio Raceline Cobalt, CNC alloy, fully sealed, 28h, 3/8" crmo axle

Rear Hub: Radio Raceline Cobalt, CNC alloy, fully sealed, 28h, 3/8" crmo axle

Rims: Radio Raceline A-M5 double wall, alloy, 28h (front & rear)

Seat: Radio Raceline Mini combo

Seatpost: Radio Raceline 22.2mm alloy

Seat Clamp: Radio Raceline, forged alloy

Tires: Arisun XLR8, 20 x 1-1/8

Weight: 8.07kg / 17.78lbs

Geometry
Frame

Top Tube: 18.5"

Chainstay: 12.85"

Head Tube Angle: 73°

Seat Tube Angle: 71°

Bottom Bracket Height: 10.4"

Handlebar

Rise: 4.25"

Width: 24"

Backsweep: 8°

Upsweep: 2
Care & Maintenance

Keep the drivetrain clean and lightly lubricated for peak performance. Race wheels should be checked regularly for spoke tension. Brake pads and cable tension may require small tune-ups as the rider progresses. Store indoors to protect lightweight alloy components.
Size & Fit

Best for junior racers growing into the sport and not yet ready for Expert sizing. Ideal rider height range: 125–145cm. Lightweight geometry makes handling intuitive and responsive for younger competitors.

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