The Radio Saiko 20 Inch Bike is a silver kids BMX with black Salt Tracer Tyres and teal rims, shown in profile on a white background.
Radio Saiko 20 Bike (2021) / Matt Black / 19.25TT
Radio Saiko 20 Bike (2021) / Matt Purple / 19.25TT
A Radio Saiko 20 Inch Bike in black with turquoise wheel and grip accents and Salt Tracer Tyres is displayed on a white background.
Close-up of the Radio Saiko 20 Inch Bike's wheel featuring black spokes, a black hub, and a green rim with Salt Tracer Tyres against a white background.
Close-up of the Radio Saiko 20 Inch Bike front wheel, highlighting black spokes, axle, Salt Tracer Tyres, and part of the fork with visible brand markings.
Close-up of the crankset, chainring, chain, and pedal on a black-framed Radio Saiko 20 Inch Bike with green-accented Salt Tracer Tyres.
Close-up of a black pedal attached to a crank arm, with part of the rear wheel and chain visible on a Radio Saiko 20 Inch kids BMX bike.
Close-up view of the Radio Saiko 20 Inch Bike in pink, highlighting the crank arm, chainring, Salt Tracer Tyres, chain, and rear wheel tire.
Close-up of the Radio Saiko 20 Inch Bike's handlebar with mint green end cap, brake lever, Salt Tracer Tyres, seat, and part of the frame. This sleek kids BMX is shown against a white background.
A Radio Saiko 20 Inch Bike in purple with black handlebars, seat, and Salt Tracer Tyres is displayed on a white background.
Close-up of a black RBC-embossed bicycle seat attached to the Radio Saiko 20 Inch Bike frame and wheel, photographed against a white background.
Close-up of the Radio Saiko 20 Inch Bike wheel, featuring black spokes, a black Radio hub, Salt Tracer Tyres, and a metallic pink fork—showcasing stylish details for an eye-catching kids BMX.
Close-up of the Radio Saiko 20 Inch Bike's handlebar with a black rubber grip and brake lever, ideal for a kids' BMX bike, shown against a white background.
Close-up of the handlebar and stem on a Radio Saiko 20 Inch Bike, showing its bright pink BMX frame, part of the front tire with Salt Tracer Tyres, and a visible brake cable.
The Radio Saiko 20 Inch Bike, black with teal handlebar grips and wheel rims, plus Salt Tracer Tyres, is displayed on a white background.
Close-up of a black bicycle seat attached to the metallic pink frame of a Radio Saiko 20 Inch Bike, with "Radio" branding visible on the seat.
The Radio Saiko 20 Inch Bike is shown from the side against a white background, featuring a magenta frame with black handlebars, seat, pedals, and Salt Tracer Tyres.
Close-up of the Radio Saiko 20 Inch Bike’s rear wheel, showing its pink frame, black spokes and chain, Salt Tracer tyres, and a RADIO-labeled hub.
Close-up of a black fork and wheel with a black tire and green sidewall, featuring Salt Tracer Tyres, shown against a white background—designed for the Radio Saiko 20 Inch Bike.
The Radio Saiko 20 Inch Bike, a black kids BMX with a compact frame, single gear, Chromoly three-piece cranks, and thick tires, is shown in side view against a white background.
The Radio Saiko 20 Inch Bike, a black kids BMX with teal wheel rims, black pedals, Chromoly three-piece cranks, and a straight handlebar, is shown in profile against a white background.
The Radio Saiko 20 Inch Bike is a maroon kids BMX with black handlebars, seat, pedals, and wheels. Shown side view on white background, it features durable Chromoly three-piece cranks inspired by the original Radio Saiko 20 bike.
Close-up of the Radio Saiko 20 Inch Bike's front shows handlebars, stem, and front wheel with a teal rim and Salt Tracer Tyres, plus part of its metallic gray frame against a white background.
The Radio Saiko 20 Inch Bike features a gray frame, black handlebars and seat, black tires with teal rims, and Salt Tracer Tyres, displayed on a white background.
Close-up of the Radio Saiko 20 Inch Bike crankset, chain, and pedal attached to a metallic frame with a black tire featuring a teal Salt Tracer Tyres sidewall.
Close-up of the black RADIO seat on the Radio Saiko 20 Inch Bike, mounted to the frame with part of the rear wheel and Salt Tracer Tyres in view.
Close-up of the front part of the Radio Saiko 20 Inch Bike, a gray kids BMX with black handlebars and Salt Tracer Tyres, featuring light blue rim accents.
Close-up of a Radio Saiko 20 Inch Bike's handlebars, brake lever, and upper frame against a white background. "RADIIDWED." is printed on the handlebars of this kids BMX bike.
Close-up of a black crankset and chainring on the Radio Saiko 20 Inch Bike in grey, fitted with Salt Tracer Tyres, showing part of the rear wheel and tire.
Close-up of the metallic gray Radio Saiko 20 Inch Bike frame, showing the front fork, head tube, cable routing, and part of the front tire with Salt Tracer Tyres.
Close-up of the rear wheel on a Radio Saiko 20 Inch Bike, featuring the hub, spokes, axle, and a mint green and black Salt Tracer Tyre.
Close-up of the Radio Saiko 20 Inch Bike’s rear wheel, chain, pedals, and frame, highlighting Salt Tracer Tyres with black tread and teal rim on this metallic gray kids BMX bike.
Close-up of the Radio Saiko 20 Inch Bike handlebar, showcasing a black rubber grip with turquoise end cap, Salt Tracer Tyres, and a brake lever—ideal for young BMX enthusiasts.
Close-up of the black BMX handlebar and stem on the metallic blue Radio Saiko 20 Inch Bike, showcasing bolt details, a section of brake cable, and Salt Tracer Tyres.
The Radio Saiko 20 Inch Bike for kids features a silver frame, black seat and handlebars, Salt Tracer tyres, and turquoise rims. Shown on a white background.
Close-up of a Radio Saiko 20 Inch Bike's front wheel with black spokes, a black Rant hub, Salt Tracer Tyres, and a turquoise rim, set against a white background.

Description

This bike is absolutely psycho- just as the name suggests! Radio have outdone themselves with this formidable bike and the specs tab proves it! Some of the incredible parts installed on this beast include Salt Tracer Tyres in a nice and wide 2.35", Radio Am 36H Wheel Set, Radio Am Chromoly Three Piece Cranks, Salt Pro Headset and loads more. If you are looking for a bike for your kids to thoroughly enjoy- look no further!

Features
  • Built for kids to enjoy. A 19.25" top tube with 28" bars and 165mm cranks fits a growing rider on 20 inch wheels.
  • Chromoly down tube and cranks. Chromoly in the down tube and in the tubular 3-piece cranks puts strength where a kid's bike cops the most abuse.
  • Wide Salt Tracer tyres. 2.35" tyres front and rear on the Radio AM 36H wheel set give loads of grip on concrete and dirt.
  • Salt Pro sealed headset. An integrated sealed bearing headset keeps the bars turning smoothly, and the frame has holes for removable gyro tabs.
  • Sealed MID bottom bracket. Press fit sealed bearings in the middle and a semi-sealed Radio AM cassette hub keep grit out of the drivetrain.

Specifications
  • Size: 19.25" top tube
  • Frame: Radio Saiko 20, Cr-Mo down tube, 1020 hi-ten
  • Top tube: 19.25"
  • Chainstay: 13.2"
  • Head tube angle: 75°
  • Seat tube angle: 71.5°
  • Standover: 8"
  • Bottom bracket height: 11.75"
  • Fork: Radio Saiko 20, 1020 hi-ten, Cr-Mo steerer, tapered legs
  • Headset: Salt Pro integrated, sealed bearing
  • Stem: Salt Pro topload, 50mm reach
  • Bars: Radio Saiko, 1020 hi-ten, 8.2" rise, 28" wide, 11° backsweep, 2° upsweep
  • Grips: Radio AM, flangeless, 150mm
  • Brakes: Radio AM alloy u-brake, rear
  • Brake lever: Radio AM alloy
  • 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 Pro, nylon fibreglass
  • Front hub: Radio AM, alloy, loose ball, 3/8" male axle, 36H
  • Rear hub: Radio AM cassette, alloy, semi-sealed, 9t, 14mm axle, 36H
  • Rear cog: 9T cassette driver, loose ball
  • Rims: Radio AM, single wall, 36H, front and rear
  • Tyres: Salt Tracer, 2.35", front and rear
  • Seat: Radio Century slim padded combo
  • Seat clamp: Radio slim alloy
  • Weight: 11.90 kg
  • Note: Frame has holes for removable gyro tabs.

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 Saiko 20 Inch Bike

Brand: Radio SKU:

$699.99 AUD

Or 4 payments of $174.99 AUD with

Recommended Rider Height:

147-157cm

Colour - Black

Top Tube Length - 19.25

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
$699.99 AUD

Price match request

Radio Saiko 20 Inch Bike - Black / 19.25

Metro bike shipping from $59.99

Regional and remote rates may differ

Free in-store pickup - Brisbane

Availability

19.25
Matt Black
Matt Purple
Black
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● In stock at LUXBMX ● With supplier ● Preorder ○ Sold out

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