Cobalt Junior Complete Bike

Built around race-proven geometry and carefully selected components, the Cobalt range is designed to get riders up to speed from day one. The Cobalt Junior takes things to the next level, delivering a bigger bike without the extra weight. At just 8kg, it's one of the lightest entry-level Junior bikes on the gate.

This year's updated colours and graphics ensure the Cobalt stands out trackside, while sealed front hubs and integrated headsets come standard across the range for season-long reliability. When low weight, race-ready performance, and value matter, the Cobalt Junior delivers.

  • FRAME: 6061-T6 alloy frame, forged dropouts with int. chaintensioner
  • FORK: crmo fork, 1" butted steerer, hi-ten fork legs, 23mm offset
  • HANDLEBAR: 4130 crmo bar, seamless
  • GRIPS: RADIO RACELINE "COBALT" grips, diamond knurling, closed end, flangeless, 130mm length
  • STEM: ARISE "COBALT" toploader stem, ext. 40mm, alloy
  • HEADSET: RADIO RACELINE integrated headset, sealed, 1"
  • BRAKE LEVER: RADIO RACELINE "JUNIOR" brake lever, rear
  • BRAKE: RADIO RACELINE "MINI" V-brake, rear
  • CRANK: RADIO RACELINE "COBALT" 3pc crank, forged alloy, 155mm length
  • BB: RADIO RACELINE BB set, BSA square taper, sealed
  • PEDALS: RADIO RACELINE "COBALT JUNIOR" pedal, nylon
  • CHAIN: KMC "Z6" chain, 1/2" x 3/32"
  • SPROCKET: RADIO RACELINE sprocket, 40T, alloy
  • DRIVER: ATA freewheel, 16T, 1/2" x 3/32", crmo
  • FRONT HUB: RADIO RACELINE "COBALT" front hub, alloy cnc, fully sealed, 28h, 3/8" crmo axle
  • REAR HUB: RADIO RACELINE "COBALT" front hub, alloy cnc, fully sealed, 28h, 3/8" crmo axle
  • FRONT RIM: RADIO RACELINE "A-M5" rim, double wall, 28h, alloy
  • REAR RIM: RADIO RACELINE "A-M5" rim, double wall, 28h, alloy
  • SEAT: RADIO RACELINE "MINI" combo seat
  • SEAT POST: RADIO RACELINE seat post, 22.2mm, alloy
  • SEAT CLAMP: RADIO RACELINE seat clamp, forged alloy
  • TIRES: ARISUN "XLR8" tires, 20" x 1-1/8"

Weight: 7.62kg / 16.79lbs

 

Frame Geometry:

Top Tube Length 18.5"
Chain Stay Length 12.85"
Head Tube Angle 73°
Seat Tube Angle 71°
Bottom Bracket Height  10.4"

 

Handlebar Geometry:

Rise 4.25"
Width 24"
Backsweep
Upsweep

 

Color