Cobalt Expert BMX Bike – Lightweight Alloy Race Machine

Cobalt Expert Complete Bike by Radio Bikes

£545.00 GBP

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HOOK
Built for young racers who live for the snap of the gate and the rush of the first straight.

IDENTITY
The Cobalt Expert is where rising riders level up. With proven race geometry, a lighter 6061-T6 alloy frame, and components dialled for real track speed, this bike brings pro-inspired performance to riders stepping into the Expert class. Wider 1 3/8 ARISUN XLR8 tires boost corner speed and control, while the longer 19.5 toptube and 50mm reach stem deliver stability when the pace gets serious. Fully sealed hubs and an integrated headset keep things smooth, consistent, and ready for race day after race day.
This is an all-level race machine for young riders chasing progression and podiums.

ENERGY
Out of the gate. Into the fight. The Cobalt Expert is built to carry momentum and never look back.

DETAILS
Fresh paint, refined graphics, and upgraded sealed components make this year's Cobalt lighter, faster, and cleaner than ever. Built to be spotted, built to be ridden hard.

Highlights
• Lightweight 6061-T6 alloy race frame with internal tensioner
• Wider 1 3/8 ARISUN XLR8 tires for race-ready grip
• Longer Expert-class geometry (19.5 toptube) for stability
• Fully sealed hubs + integrated headset for smooth, low-maintenance performance
• Forged alloy 3-piece cranks for stiffness on the gate
• Double-wall rims for strength under sprint load

Technical Specs
• Frame: 6061-T6 alloy, forged dropouts, internal chain tensioner
• Fork: Chromoly 1–1/8 butted steerer, hi-ten legs, 23mm offset
• Handlebar: 4130 chromoly, seamless
• Grips: Radio Raceline Cobalt flangeless grips, 130mm
• Stem: Radio Raceline Cobalt topload, 50mm, alloy
• Headset: FSA No.28 integrated, sealed, 1–1/8
• Brake Lever: Promax XL-378 rear
• Brake: Promax MV-85 rear
• Crank: Radio Raceline Cobalt 3-piece forged alloy, 165mm
• Bottom Bracket: Radio Raceline BSA square-taper sealed
• Pedals: Radio Raceline Cobalt Pro alloy
• Chain: KMC Z6, 1/2 x 3/32
• Sprocket: Radio Raceline alloy 42T
• Driver: ATA freewheel, 16T, chromoly
• Front Hub: Radio Raceline Cobalt fully sealed, CNC alloy, 28h, 3/8 chromoly axle
• Rear Hub: Radio Raceline Cobalt fully sealed, CNC alloy, 28h, 3/8 chromoly axle
• Rims: Radio Raceline A-M5 double-wall alloy, 28h (front & rear)
• Seat: Radio Raceline Cobalt Pro combo
• Seatpost: Radio Raceline alloy 25.4mm
• Seat Clamp: Radio Raceline forged alloy
• Tires: Arisun XLR8 20 x 1–3/8
• Weight: 8.95kg / 19.73lbs

Geometry
Frame
• Top Tube: 19.5
• Chainstay: 13.6
• Head Tube Angle: 73°
• Seat Tube Angle: 71°
• Bottom Bracket Height: 10.8

Handlebar
• Rise: 5.75
• Width: 24.5
• Backsweep: 8°
• Upsweep: 2°

Keep tires at high PSI for maximum speed. Check chain tension regularly using the integrated adjusters. Keep bearings clean and rotating freely, especially after wet races. Brake pads and rim surfaces should be wiped down often for consistent stopping power.

Designed for Expert-class youth racers. Best for riders transitioning into longer, faster geometry with a toptube around 19.5. Ideal height range: approximately 135–155 cm, depending on rider preference and racing style.

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