A great choice for a young rider wanting a straightforward 20-inch bike for parks, paths, dirt and family rides.
The Radius Explosive 20 is a junior BMX-style bike built for young riders who want to cruise, explore and develop their confidence. The Hi-Ten steel frame and steel BMX fork provide a stable, reassuring platform, while the low stand-over height makes getting on and off straightforward.
Out on the path or dirt, the wide 560 mm BMX handlebar gives responsive steering and a sporty feel. The 20 x 2.125 tyres add grip and stability across everyday riding surfaces, and the single-speed drivetrain keeps operation simple so your child can concentrate on enjoying the ride.
Braking is easy to understand, with a rear coaster pedal brake complemented by a front linear-pull brake operated from short-reach levers. A cold-forged one-piece crank, 36-hole rims, kickstand and protective handlebar and stem pads round out a practical package for everyday adventures. Choose the Explosive 20 when you want simple controls, confident handling and classic BMX style in a bright Gloss Orange / Black finish.
Low stand-over height
Makes mounting and dismounting easier, helping young riders feel more confident when starting and stopping.
Hi-Ten steel BMX frame
Provides a sturdy foundation for everyday riding, with Radius Junior BMX geometry for a familiar BMX-inspired position.
Stable steel BMX fork
Supports predictable handling while giving the bike its sporty BMX appearance.
20 x 2.125 tyres
The wide BMX-style tyres provide useful grip and stability on paths and dirt.
Coaster and front brake setup
The rear coaster brake is paired with a front linear-pull brake for simple, balanced stopping control.
Single-speed drivetrain
The 40T chainwheel and 18T sprocket keep the controls uncomplicated for young riders.
Adjustable quill stem
The 4-bolt quill-style stem allows useful cockpit adjustment as the rider develops.
Ready for everyday use
A kickstand plus protective handlebar and stem pads add practical convenience and extra protection.
Frame & Fork
Drivetrain
Brakes
Wheels & Tyres
Cockpit
Geometry highlights
General
Radius is an Australian-designed bicycle brand within the Apollo Bicycles stable, focused on accessible bikes for kids, families and recreational riders. The range centres on practical designs, approachable fit and everyday value rather than specialist racing or high-performance categories.
The brand is known for building entry-level and family-friendly bikes with comfort-focused layouts, easy handling and a broad spread of wheel sizes. Radius also highlights Australian design, value for money and a limited lifetime warranty as core parts of the brand offering.
