Radio Race Cobalt Junior BMX Race Bike

€559.95 Out of Stock

Radio Race Cobalt Junior BMX Race Bike

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€559.95 Out of Stock
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  • The Cobalt line combines proven geometry and dialled components giving you the best start out of the gate during the 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 theres. All Cobalt bikes feature fully sealed front hubs and integrated headsets, making them simply unstoppale when comparing price to spec.

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Product Specs
  1. FRAME MATERIAL: 6061 T6 alloy
  2. WHEEL SIZE: 20"
  3. TOP TUBE LENGTH: 18.5"
  4. CHAIN STAY LENGTH: 12.85"
  7. FORKS: cr-mo, 1″ butted steerer tube, hi-ten fork legs, 23mm offset
  8. BARS: 4130 seamless cr-mo
  9. STEM: Radio, Cobalt-toploader, ext. 40mm, alloy
  10. HEADSET: Radio, integrated headset, sealed, 1″
  11. BRAKE MOUNTS: Welded
  12. BRAKES: PROMAX “MV-87” alloy brake rear
  13. FRONT HUB: RADIO “Cobalt” alloy CNC hub, fully sealed, 3/8″s, 28h, crmo axle
  14. FRONT RIM: Radio, A-M5, double wall, 28H, alloy
  15. REAR HUB: RADIO “Cobalt” alloy CNC hub, fully sealed, 3/8″s, crmo axle, 28h, flip flop
  16. REAR RIM: Radio, A-M5, double wall, 28H, alloy
  17. TYRES: Arisun, XLR8, 20″x 1-1/8″
  18. SPROCKET: RADIO alloy, 40t sprocket
  19. CRANKS: RADIO “Cobalt” forged alloy 3pc crank, 155mm long
  20. BB: Radio, BSA square taper, sealed
  21. PEDALS: Radio, Cobalt Junior, nylon
  22. SEAT: RADIO “Mini” combo seat
  23. GEARING: 40/16
  24. WEIGHT: 8.07kg/ 17.78lbs

Product Highlights
  • Junior sized BMX bike. Designed for the needs of racers who are 4ft 6" - 5ft 1" (138cm - 155cm)
  • A BMX race specific bike great for those riders just getting started
  • Strong and lightweight construction
  • Sealed bearings throughout
  • Integrated headset

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We have compiled a complete BMX Race Bike Buyers Guide to help you through the process of finding your perfect race bike. Here at sourcebmx we are all riders so we can offer advice that only 100% rider-owned bmx shops can - just ask!

Click here to view all BMX Race Bikes


The first thing you will need to do is make sure you get the correct size BMX race bike, based on your height. BMX race bikes are sized from Mini (The smallest) through to Pro (adult) sizes. These sizes refer to the overall size of the frames and parts but the wheel diameter will remain the same at 20” despite the width of the tyres varying.

Take a ride through our handy guide to find out what size bike best suits you.

Note: there is some overlap between sizes as personal preference comes into the equation.
Rider Height (ft & in) Rider Height (cm) Wheel Width (in)  Bike Size
Up to 4'4" Up to 130cm 1 - 1/8 Micro Mini
4'2" - 4'10" 127cm - 148cm 1 - 1/8 Mini
4'6" - 5'1" 138cm - 155cm 1 - 1/8 Junior
5'0" - 5'4" 150cm - 165cm 1 - 3/8 Expert
5'2" - 5'6" 155cm - 170cm 1 - 3/8 Expert XL
5'3" - 5'8" 160cm - 175cm 1.75 Pro
5'7" - 6'0" 170cm - 185cm 1.75 Pro XL
6'0" + 185cm + 1.75 Pro XL +

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