A Radio Saiko 18 Inch Bike in red with black tires, pedals, and handlebars is displayed in a side view on a white background.
The Radio Saiko 18 Inch Bike is a black BMX kids bike featuring teal rims, a padded seat, and standard handlebars, shown against a white background.
The Radio Saiko 18 Inch Bike, a black BMX for kids with straight handlebars and a compact frame, is displayed in side profile on a white background.
Radio Saiko 18 Inch Bike, featuring red-rimmed Salt Tracer tyres and "RADIOBIKECO" branding, shown side-on against a white background. A stylish and high-performance kids BMX bike perfect for young riders.
Radio Saiko 18 Bike (2021) / Purple / 18TT
Radio Saiko 18 Bike (2021) / Black / 18TT
The Radio Saiko 18 Inch Bike, featuring a turquoise frame with black handlebars and seat, plus sleek Salt Tracer Tyres, stands out against a white background.
The Radio Saiko 18 Inch Bike is a black BMX with red-rimmed wheels, featuring a Radio Bikes sticker on the frame and equipped with durable Radio Am Chromoly Three Piece Cranks.
Close-up of the black crankset, pedal, chainring, and rear wheel with a pink rim and Salt Tracer Tyres on the Radio Saiko 18 Inch Bike, shown against a white background.
Close-up of a black bicycle front fork featuring a black tire with "Tracer 18 x 2.20" markings and a red-rimmed wheel—showcasing the Radio Saiko 18 Inch Bike with Salt Tracer Tyres.
Close-up of the black "RADIO" seat on the Radio Saiko 18 Inch Bike in teal, featuring part of the rear wheel and brake cable—ideal for young BMX fans.
Close-up of a black seat labeled "RADIO" on the frame of the Radio Saiko 18 Inch Kids BMX Bike, shown against a white background.
Close-up of the black handlebar, stem, and front brake cable on the Radio Saiko 18 Inch Bike, with "RADIOBIKES" branding on the frame and Salt Tracer Tyres visible.
Close-up of a black RADIOBIKECO. crank, chainring, and pedal beside the rear wheel on a Radio Saiko 18 Inch Bike kids BMX with Salt Tracer Tyres.
Close-up of black BMX handlebars and stem with visible cables; "RADIOBIKECO." logo partially shown on the frame, featuring Salt Tracer Tyres on the Radio Saiko 18 Inch Bike—an ideal kids BMX bike.
Close-up of the Radio Saiko 18 Inch Bike’s rear wheel, featuring a black RADIO-labeled hub, black spokes, red rim, and Salt Tracer Tyres against a white background.
Close-up of a turquoise Radio Saiko 18 Inch Bike frame featuring a black pedal crank, chainring, chain, and rear tire with Salt Tracer Tyres. The crank arm displays the "RADIOBIKECO" logo.
Close-up of the rear wheel on the Radio Saiko 18 Inch Bike, featuring a black "RADIO" hub, spokes, Salt Tracer Tyres, and a mint green frame.

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 2.2", Radio Am Hub 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
  • Sized for younger riders. An 18" top tube, 26.5" bars and 152mm cranks put a smaller rider in a proper riding position.
  • 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. 2.2" tyres front and rear give plenty of grip on concrete and dirt while your kid learns the ropes.
  • Salt Pro sealed headset. An integrated sealed bearing headset keeps the front end 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 the muck out of the drivetrain.

Specifications
  • Size: 18" top tube
  • Frame: Radio Saiko 18, Cr-Mo down tube, 1020 hi-ten
  • Top tube: 18"
  • Chainstay: 12.2"
  • Head tube angle: 75°
  • Seat tube angle: 71.5°
  • Standover: 7.5"
  • Bottom bracket height: 10.75"
  • Fork: Radio Saiko 18, 1020 hi-ten, crmo steerer, tapered legs
  • Headset: Salt Pro integrated, sealed bearing
  • Stem: Salt Junior top loading, 40mm reach
  • Bars: Radio AM 18, 1020 hi-ten, 7.9" rise, 26.5" wide, 10° backsweep, 3° 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, 152mm, 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, front and rear
  • Tyres: Salt Tracer, 2.2", front and rear
  • Seat: Radio Century slim padded combo
  • Seat clamp: Radio slim alloy
  • Weight: 10.62 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 18 Inch Bike

Brand: Radio SKU:

$699.99 AUD

Or 4 payments of $174.99 AUD with

Recommended Rider Height:

122-147cm

Colour - Black

Top Tube Length - 18

18 inch BMX sizing

An 18 inch bike suits a rider of about 122 to 147cm, usually 7 to 11 years old, on an 18 to 18.5 inch top tube. It is the last step before a full size 20 inch.

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 your rider is near 147cm and still growing, look at a 20 inch instead: it is the size they will keep riding.

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.

  • Between an 18 and a 20? Take the 20. It is the size they will keep riding, and an 18 gets outgrown quickly.
  • They should be able to stand over the top tube with both feet flat on the ground.

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

Read the full buying guide

18 inch BMX sizing

An 18 inch bike suits a rider of about 122 to 147cm, usually 7 to 11 years old, on an 18 to 18.5 inch top tube. It is the last step before a full size 20 inch.

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 your rider is near 147cm and still growing, look at a 20 inch instead: it is the size they will keep riding.

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.

  • Between an 18 and a 20? Take the 20. It is the size they will keep riding, and an 18 gets outgrown quickly.
  • They should be able to stand over the top tube with both feet flat on the ground.

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 18 Inch Bike - Black / 18

Metro bike shipping from $39.99

Regional and remote rates may differ

Free in-store pickup - Brisbane

Availability

18
Black
Purple
Black/Red
Mint
Urban Grey Metallic
Deep Red Metallic

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

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