Radio Cobalt Junior Bike

Sale price$899.99 AUD

Or 4 payments of $224.99 AUD with

Recommended Rider Height:

120-150cm

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The Radio Cobalt Junior Bike, shown in profile on a white background, features a lightweight black frame, straight handlebars, and large tires—ideal as an entry-level BMX race bike for aspiring riders.

Radio Cobalt Junior Bike / Black / 18.5

Sale price$899.99 AUD

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RABK231-26-BLK

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Radio Cobalt Junior Bike (2021) / Cyan / 18.5TT

Radio Cobalt Junior Bike / Cyan / 18.5

Sale price$799.99 AUD

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RABK169-21-CYN

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A red BMX race bike with a black seat, black handlebars, and thin tires. The frame and rims flaunt red accents. This Radio Cobalt Junior Bike has a single gear and a rear brake.

Radio Cobalt Junior Bike / Metallic Red / 18.5

Sale price$799.99 AUD

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RABK169-21-RED

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The Radio Cobalt Junior Bike features a red frame, black tires, and a straight handlebar, set against a white background—an ideal entry-level BMX race bike.

Radio Cobalt Junior Bike / Burned Orange Metallic / 18.5

Sale price$899.99 AUD

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RABK231-26-ONG

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Description

The Radio Raceline has continued its upwards trajectory in the "ready to race" category of complete off-the-shelf race bikes. Every one of their bikes in the Cobalt range can go from the shop to the podium with ease, and is the perfect entry level race bike for your young rider.

This beast is stacked full of loads of epic Radio parts to ensure a ride like no other! Radio Raceline Cobalt Grips provide loads of grip for your hands, The Radio Raceline Cobalt Hubs laced up to double walled Radio Raceline A-M5 Rims, which means they can take a beating you shredder starts to send the jumpks. After all, every BMX kids just wants to jump stuff, and this bike will take that punishment as they learn the ropes of BMX racing.

Fresh out of the box for with incredible 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.

We sell loads of these complete race bikes, and for good reason, awesome build quality at this price point makes them extremely great value and will last a season or two before your racer grows into the next size.

 

Key Specs:

  • TT Length: 18.5"
  • BB Height: 10.4"
  • Gearing: 40 x 16
  • Gear Ratio: 49.75"
  • Crank Length: 155mm
  • Tyres: 20 x 1-1/8
  • Weight: 8.07kg

Specifications
Frame
- 6061-T6 alloy frame, forged dropouts with int. chaintensioner
Fork - crmo fork, 1" butted steerer, hi-ten fork legs, 23 mm offset
Bars - 4130 crmo bar, seamless
Grips - Radio Raceline Cobalt grips, diamond knurling, closed end, flangeless, 130 mm length
Stem - Arise Cobalt toploader stem, ext. 40 mm, alloy
Headset - Radio Raceline integrated headset, sealed, 1"
Lever - Radio Raceline Junior brake lever, rear
Brakes - Radio Raceline Mini V-Brake, rear
Cranks - Radio Raceline Cobalt 3pc crank, forged alloy, 155 mm length
BB - Radio Raceline bb set, BSA square taper, sealed
Pedals - Radio Raceline Cobalt Junior pedal, nylon
Chain - KMC Z6 chain, 1/2" × 3/32"
Sprocket - Radio Raceline sprocket, 40T, alloy
Driver - ATA freewheel, 16T, 1/2" × 3/32", crmo
Front hub - Radio Raceline Cobalt front hub, alloy cnc, fully sealed, 28h, 3/8" crmo axle
Rear hub - Radio Raceline Cobalt rear hub, alloy cnc, fully sealed, 28h, flip flop, 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, 22.2 mm, alloy
Seat clamp - Radio Raceline seat clamp, forged alloy
Tyres - Arisun XLR8 tyres, 20" × 1-1/8"
Weight - 8.07kg / 17.78lbs

FRAME / BAR 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°

Specifications

FRAME / BAR 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°

Size 18.5TT
Frame 6061-T6 alloy frame, forged dropouts with int. chain tensioner
Fork Cr-Mo, 1″ butted steerer tube, hi-ten fork legs, 23mm offset
Headset FSA "No.28" integrated headset, sealed, 1"
Stem Radio Raceline "COBALT" top loader stem, ext. 40mm, alloy
Handlebar 4130 CrMo bar, seamless
Grips Radio Raceline "COBALT" grips, diamond knurling, closed end, flangeless, 130mm length
Brake Lever Promax "XL-378" brake lever, rear
Rear Brake Promax "MV-87" brake, rear
Crank Radio Raceline "COBALT" 3pc crank, forged alloy, 155mm length
Chainring Radio sprocket, 40T, alloy
Bottom Bracket Radio Raceline BB, BSA square taper, sealed
Pedals Radio Raceline Junior, nylon
Chain KMC "Z6" chain, 1/2" x 3/32"
Front Hub Radio Raceline "COBALT" front hub, alloy cnc, fully sealed, 28H, 3/8" crmo axle
Rear Hub Radio Raceline "COBALT" rear hub, alloy cnc, fully sealed, 28H, flip flop, 3/8" crmo axle
Rear Cog ATA freewheel, 16T, 1/2" x 3/32", crmo
Rims Radio Raceline "A-M5" rim, double wall, 28H, alloy
Spokes Radio Raceline "A-M5" rim, double wall, 28H, alloy
Tyres Arisun "XLR8" TYREs, 20" x 1-1/8"
Seat Radio “Mini” combo seat
Seat Clamp Radio slim alloy seat clamp
Seat Post Radio seat post, 25.4mm, alloy
Gearing / Ratio 40x16 / 49.75"


 
FRAME / BAR 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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