Radio Raceline Cobalt Junior 20"

The Cobalt line combines proven geometry and dialled components giving you the best start out of the gate during your first days racing. The Cobalt Junior steps up in size without packing on the pounds. At only 8kg, this is one of the lightest junior entry-level bikes out there.

Fresh out of the box, with incredible new paint and graphics, you’ll be able to spot a Cobalt on the track very easily. All Cobalt bikes now feature full sealed front hubs and integrated headsets, making them simply unbeatable when comparing price to spec. The Cobalt is one seriously unstoppable machine.

• Frame - 6061 T6 alloy, forged dropouts with int. chain tensioner
• Fork - Cr-Mo, 1″ butted steerer tube, hi-ten fork legs, 23mm offset
• Handlebar - 4130 seamless Cr-Mo
• Grips - Radio, diamond knurling, closed end, flangeless, 130mm length
• Stem - Radio, 'Cobalt-toploader', ext. 40mm, alloy
• Headset - Radio, integrated headset, sealed, 1″
• Brake lever - Promax 'XL-378' alloy brake rear
• Brake - Promax 'MV-87' alloy brake rear
• Crank - Radio 'Cobalt' forged alloy 3pc crank, 155mm long
• BB - Radio, BSA square taper, sealed
• Pedals - Radio, 'Cobalt Junior', nylon
• Chain - KMC, Z6, 1/2″ x 3/32″
• Sprocket - Radio alloy, 40T sprocket
• Driver - ATA, 16T, 1/2″ x 3/32″, Cr-Mo
• Front hub - Radio 'Cobalt' alloy CNC hub, fully sealed, 3/8″s, 28H, Cr-Mo axle
• Rear hub - Radio 'Cobalt' alloy CNC hub, fully sealed, 3/8″s, Cr-Mo axle, 28H, flip flop
• Rims - Radio, A-M5, double wall, 28H, alloy F & R
• Seat - Radio 'Mini' combo seat
• Seat post - Radio 22.2mm alloy
• Seat clamp - Radio slim alloy seat clamp
• Tyres - Arisun, 'XLR8', 20″x 1-1/8″
• Weight - 8.07kg/ 17.78lbs

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 - 8°
• Upsweep - 2°