The Radio Astron FS 20 Inch Bike features a silver chromoly frame, black handlebars, seat, and tires, plus red wheel rims. Shown in side profile on a white background, this BMX bike truly stands out.
A black BMX bike with a full chromoly frame, wide tires, high handlebars, and a padded seat, designed for off-road and stunt riding. The brand name "Radio Astron FS 20 Inch Bike" is visible on the frame.
The Radio Astron FS 20 Inch Bike is a black BMX bike with a full chromoly frame, wide handlebars, and thick tires, designed for trick riding and stunts. It also features Radio Pro Hubs for exceptional performance.
This Radio Astron FS 20 Inch Bike features thick tires, a padded seat, and handlebar grips. The full chromoly frame showcases the "RADIO BIKE CO." logo and includes Radio Pro Hubs, making it the ultimate ride for thrill-seekers.
Close-up of a Radio Astron FS 20 Inch Bike wheel showcasing the tire, spokes, chain, and Radio Pro Hubs in a detailed, clear view.
Close-up view of the rear wheel on a black Radio Astron FS 20 Inch Bike, highlighting the spokes, tire, Radio Pro Hubs, and part of the chain.
Close-up view of a Radio Astron FS 20 Inch Bike's front wheel and fork. The tire showcases a textured tread pattern, while the sleek black fork boasts a glossy finish, perfectly complementing the full chromoly frame.
Close-up of a black bicycle seat with the brand "Radio" visible on the side. The frame and rear tire of the Radio Astron FS 20 Inch Bike, featuring a full chromoly frame and Radio Pro Hubs, are partially visible.
Close-up of a black bicycle's drivetrain, featuring a chainring, chain, and rear tire. The crank arm displays the brand name "Radiobike Co." This Radio Astron FS 20 Inch Bike also boasts Radio Pro Hubs for enhanced performance.
Close-up of the handlebars on a Radio Astron FS 20 Inch Bike, highlighting the grips, brake lever, and part of the full chromoly frame.
Close-up of the handlebar and front tire on the Radio Astron FS 20 Inch Bike, showcasing the stem, cables, and part of the front suspension fork on this black BMX bike with its full chromoly frame.

Description

An Astron is star... Yep, We agree...This bike is a star! This bike will be shining bright up in the sky with crowds flocking to see it in it's glory! With a full chromoly frame, fork and bars, you will feel cool, calm and collected whilst sailing through the skies and the loads of insane parts that Radio have decked out this bike with makes this such an incredibly special bike. Radio Pro Hubs ensure that the roll is super smooth, SaltPlus Burn Tyres provide loads of traction on a variety of surfaces, a Salt Comp Top Load Stem brings up the bars and creates a premium look and feel for the bike. So what are you waiting for? Get out there and let this star shine brightly!

Features
  • Full chromoly frame, fork and bars. Radio's Astron frame, Pro fork and Pro bar are all Cr-Mo, with removable brake mounts and guides, and the bike lands at 12.48kg.
  • Radio Pro sealed hubs. A sealed front hub and a fully sealed 9T cassette rear on 36H Saltplus Brace double wall rims keep the roll super smooth.
  • Saltplus Burn 2.30" tyres. Loads of traction on a variety of surfaces, from skatepark concrete to street, with plenty of air volume to soak up landings.
  • Gyro fitted, ready for barspins. A Salt AM rotor and cables run the Saltplus Geo XL alloy u-brake, so the bars spin without tangling the rear cable.
  • Salt Comp top load stem. 50mm reach lifts the 9" rise Radio Pro bar for a premium look and feel, with flangeless 155mm Salt Ex grips.

Specifications
  • Size: 20" wheels
  • Frame: Radio 'Astron', full Cr-Mo, removable brake mounts and guides
  • Top tube: 20.6"
  • Chainstay: 13.2"
  • Head tube angle: 76°
  • Seat tube angle: 71°
  • Standover: 7.5"
  • Bottom bracket height: 11.6"
  • Fork: Radio 'Pro', full Cr-Mo, Cr-Mo steerer, 26mm offset
  • Headset: Salt 'Pro' integrated, sealed bearing
  • Stem: Salt 'Comp' top loading, 50mm reach
  • Bars: Radio 'Pro', full Cr-Mo, 9" rise, 29.5" width, 12° backsweep, 2° upsweep
  • Grips: Salt 'Ex', flangeless, 155mm
  • Brakes: Saltplus 'Geo XL' alloy u-brake, rear, with Salt 'AM' rotor and rotor cables
  • Brake lever: Radio 'AM', alloy, rear
  • Cranks: Radio 'AM' 3pc, tubular Cr-Mo, 165mm, 8 spline
  • Bottom bracket: Mid size, press fit, sealed bearing
  • Sprocket: Radio 'Vision', steel, 25T
  • Chain: Salt 'AM', WZ1 type
  • Pedals: Radio 'Slim', nylon fibreglass
  • Front hub: Radio 'Pro', alloy, sealed, 3/8" female axle, 36H
  • Rear hub: Radio 'Pro' cassette, fully sealed, 9T driver, 14mm axle, 36H
  • Rims: Saltplus 'Brace', double wall, 36H front and rear
  • Tyres: Saltplus 'Burn', 2.30"
  • Seat: Radio 'Century' slim, padded combo seat
  • Seat clamp: Integrated slim seat clamp
  • Weight: 12.48kg

Assembly information

Your bike ships mostly assembled in the box. Finishing it takes most people 10 to 20 minutes with basic tools, and the video above walks through every step.

  • Fit the handlebars and line them up with the front wheel
  • Fit the front wheel, pedals and seat post
  • Check the brakes and tyre pressure before the first ride

Tools: Allen key set and a 15mm, 17mm or 19mm spanner for the pedals and axle nuts (bikes can vary between these three sizes). A socket is needed if installing pegs.

Rather have it done? Ask us about extra assembly before you order, or any local bike shop can finish the build for a small fee.

Radio Astron FS 20 Inch Bike

Brand: Radio SKU:

$1,199.99 AUD

Or 4 payments of $299.99 AUD with

Recommended Rider Height:

157-175cm

Colour - Chrome

Top Tube Length - 20.6

20 inch BMX sizing

A 20 inch bike is the standard adult BMX and suits riders from about 147cm up. At this wheel size the top tube is what changes the fit, so pick that by height.

Rider heightWheel sizeTop tube
60 to 91cm12"12 to 12.5"
81 to 106cm14"14 to 14.5"
96 to 122cm16"16 to 16.5"
122 to 147cm18"18 to 18.5"
147 to 157cm20"19.75 to 20.25"
157 to 168cm20"20 to 20.5"
168 to 175cm20"20.25 to 20.75"
175 to 183cm20"20.5 to 21"
183 to 190cm and up20"20.75 to 21.5"
160cm and up22"21 to 22.25"
160cm and up24"21.75 to 22"
160cm and up26"22 to 23"

Sizes overlap on purpose, so personal preference comes into it. If you land in two bands, riding style breaks the tie: longer for flow, trails and transitions, shorter for technical street and park.

How to measure

Stand your rider against a wall in the shoes they ride in, heels flat, and mark the top of their head. Measure from the floor to the mark.

Top tube is measured from the centre of the seat tube to the centre of the head tube, so it is not the same as the length of the tube you can see.

  • A 20 inch bike is the standard adult BMX and most riders end up there, so do not size a tall child down to a smaller wheel.
  • 22, 24 and 26 inch bikes are adult bikes with a bigger wheel, not bigger frames for taller riders.
  • Size up for stability through trails and transitions. Size down if you want the bike quick and twitchy for spins and grinds.
  • Top tube is fixed, but stem length, fork offset and bar position all shift how roomy the bike feels once you are on it.

Not sure? Send us their height and we will tell you what we would put them on.

Read the full buying guide

20 inch BMX sizing

A 20 inch bike is the standard adult BMX and suits riders from about 147cm up. At this wheel size the top tube is what changes the fit, so pick that by height.

Rider heightWheel sizeTop tube
60 to 91cm12"12 to 12.5"
81 to 106cm14"14 to 14.5"
96 to 122cm16"16 to 16.5"
122 to 147cm18"18 to 18.5"
147 to 157cm20"19.75 to 20.25"
157 to 168cm20"20 to 20.5"
168 to 175cm20"20.25 to 20.75"
175 to 183cm20"20.5 to 21"
183 to 190cm and up20"20.75 to 21.5"
160cm and up22"21 to 22.25"
160cm and up24"21.75 to 22"
160cm and up26"22 to 23"

Sizes overlap on purpose, so personal preference comes into it. If you land in two bands, riding style breaks the tie: longer for flow, trails and transitions, shorter for technical street and park.

How to measure

Stand your rider against a wall in the shoes they ride in, heels flat, and mark the top of their head. Measure from the floor to the mark.

Top tube is measured from the centre of the seat tube to the centre of the head tube, so it is not the same as the length of the tube you can see.

  • A 20 inch bike is the standard adult BMX and most riders end up there, so do not size a tall child down to a smaller wheel.
  • 22, 24 and 26 inch bikes are adult bikes with a bigger wheel, not bigger frames for taller riders.
  • Size up for stability through trails and transitions. Size down if you want the bike quick and twitchy for spins and grinds.
  • Top tube is fixed, but stem length, fork offset and bar position all shift how roomy the bike feels once you are on it.

Not sure? Send us their height and we will tell you what we would put them on.

Read the full buying guide
$1,199.99 AUD

Price match request

Radio Astron FS 20 Inch Bike - Chrome / 20.6

Metro bike shipping from $59.99

Regional and remote rates may differ

Free in-store pickup - Brisbane

Availability

20.6
Black Confetti
Chrome

● In stock at LUXBMX ● With supplier ● Preorder ○ Sold out

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