The Radio Evol XL 20 Inch Bike is an entry-level BMX with a crmo toptube, compact frame, thick tires, flat pedals, straight handlebars, and a single gear, displayed against a plain white background.

The Radio Evol XL 20 Inch Bike is an entry-level BMX with a crmo toptube, straight frame, thick tires, and single gear, shown on a white background.

Close-up of the Radio Evol XL 20 Inch Bike's rear wheel, highlighting the spokes, hub, axle, chain, and black frame details against a white background.

Close-up of the Radio Evol XL 20 Inch Bike's black BMX handlebar featuring a textured grip and brake lever against a white background—perfect for entry-level riders.

The Radio Evol XL 20 Inch Bike is a black entry-level BMX with a straight top tube, thick tires, and upright handlebars, shown on a white background.

Close-up of the Radio Evol XL 20 Inch Bike crankset with a black pedal, iridescent chainring, and "Radiobikeco" branding on the crank arm.

Close-up of the black Radio Evol XL 20 Inch Bike's handlebars, brake lever, and front brake cable, with part of the seat and rear wheel visible.

Close-up of a black Radio Evol XL 20 Inch Bike front wheel, highlighting the tire, spokes, fork, and partial frame—showcasing key features of this entry-level BMX model.

Close-up of a Radio Evol XL 20 Inch Bike showing its handlebars, front brake cable, frame, and front tire against a white background.

Close-up of the front wheel on a black Radio Evol XL 20 Inch Bike, showing its spokes, axle, fork, and a “RADIAL” labeled hub against a white background.

The Radio Evol XL 20 Inch Bike is a black entry-level BMX with a compact frame, crmo toptube, straight handlebars, thick tires, and a sealed integrated headset, displayed against a white background.

Close-up of the black handlebar, stem, and sealed integrated headset of the Radio Evol XL 20 Inch Bike, showing cable routing and part of the matte-finish frame—ideal for entry-level BMX riders.

Close-up of the Radio Evol XL 20 Inch Bike’s pedal, crmo toptube, "RADIObikeCO" crank arm, chain, and rear wheel against a white background.

Close-up of the Radio Evol XL 20 Inch Bike crankset featuring a black "RADIOBIKECO." crank arm and a multicolored chainring with the chain—perfect for entry-level BMX riders with its sealed integrated headset.

Close-up of a black bicycle seat, seat post, and rear wheel from the Radio Evol XL 20 Inch Bike against a white background.

Description

The Evol XL is a solid entry level machine with everything you need to start making serious progression with your riding. It boasts a 21" chromoly top tube, a sealed integrated headset and a mid sized bottom bracket, which are the details that count once you start riding it hard.

Little touches make it something different: big logo 2.30" Radio Rookie tyres, an oil slick sprocket, 25-9 gearing and a Radio Century combo seat. Add 165mm 3-piece chromoly cranks and a semi-sealed alloy cassette rear hub and it is ready to ride as it comes.

Features

21" chromoly top tube. The XL frame gives a taller rider more room, with chromoly used where the frame works hardest.
Sealed headset and mid bottom bracket. Sealed bearings in both spots, so the two places that collect the most grit stay smooth for longer.
25-9 gearing on a cassette hub. A 25T sprocket into a semi-sealed 9T aluminium cassette rear hub, driven by 165mm 3-piece chromoly cranks.
Big logo 2.30" Radio Rookie tyres. Wide rubber gives grip and comfort at the park or on the street, and the logo makes the bike stand out.
Ready for a gyro. The frame has holes for removable gyro tabs, and the rear U-brake and lever are both aluminium.

Specifications

Size: 20" wheels, 21" top tube
Frame: Radio Evol XL, chromoly top tube, 1020 hi-ten
Top tube: 21"
Fork: Radio AM, 1020 hi-ten with chromoly steerer, tapered legs
Headset: Salt Pro integrated, sealed bearing
Stem: Radio AM topload, 50mm reach
Bars: Radio AM XL 20, 1020 hi-ten
Grips: Salt EX, flangeless, 155mm
Brakes: Radio AM aluminium U-brake, rear
Brake lever: Radio AM, aluminium, rear
Cranks: Radio Rookie 3-piece, tubular chromoly, 165mm, 8 spline
Bottom bracket: Radio mid, press fit, sealed bearing
Sprocket: Radio Vision, steel, 25T, oil slick
Chain: Salt AM, WZ1 type
Pedals: Radio Pro, nylon/fibreglass
Front hub: Radio Rookie, steel, loose ball, 3/8" axle, 36H
Rear hub: Radio AM cassette, aluminium, semi-sealed, 9T, 14mm axle, 36H
Rims: Radio Rookie, single wall, front and rear
Tyres: Radio Rookie big logo, 2.30"
Seat: Radio Century combo, mid padded
Seat clamp: Radio Slim, aluminium
Gearing: 25-9
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 Evol XL 20 Inch Bike

Name: Radio Evol XL 20 Inch Bike
Brand: Radio
SKU: RABK203-26-BLK
Price: 799.99 AUD
Availability: InStock

Brand: Radio SKU: Click to copy the SKU and show the pick location

$799.99 AUD

Or 4 payments of $199.99 AUD with

Colour - Matte Black

Top Tube Length - 21

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 height	Wheel size	Top tube
60 to 91cm	12"	12 to 12.5"
81 to 106cm	14"	14 to 14.5"
96 to 122cm	16"	16 to 16.5"
122 to 147cm	18"	18 to 18.5"
147 to 157cm	20"	19.75 to 20.25"
157 to 168cm	20"	20 to 20.5"
168 to 175cm	20"	20.25 to 20.75"
175 to 183cm	20"	20.5 to 21"
183 to 190cm and up	20"	20.75 to 21.5"
160cm and up	22"	21 to 22.25"
160cm and up	24"	21.75 to 22"
160cm and up	26"	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