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Complete Bikes / Radio - Raceline Cobalt Junior Bike


Radio - Raceline Cobalt Junior Bike
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 for 2021 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, crmo axle
Rear hub - Radio “cobalt” alloy cnc hub, fully sealed, 3/8"s, crmo 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
Tires - 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°


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