Size Guides

We are here to help you get the right sized BMX bike for your situation! With so many different bikes to choose from it can be quite daunting, but don't worry- It's easy! Just pick either Freestyle or Race, measure up your height and get cracking! If you have any questions shoot us an email at help@luxbmx.com

Which guide do you need?

Pick the guide that matches what you are shopping for. If you are between sizes or buying for someone who is still growing, email help@luxbmx.com with their height and we will tell you what we would put them on.

Complete bikes Freestyle bike sizing Street, park, dirt and kids bikes. Wheel size by rider height, then top tube. Complete bikes Race bike sizing Micro through to Pro XXXXL and cruiser, sized by class and rider height. Frames Frame sizing Buying a frame on its own? Top tube length is the number that decides the fit. Protective gear Helmet sizing Measured around the head, nothing to do with bike size.

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.

Read the full buying guide

BMX race bike sizing

Race frames are sized by class, and the class you ride is set by rider height rather than age.

SizeRider heightTop tube
Micro (18" wheels)Under 120cm16.25"
Mini (20" wheels)110 to 140cm17 to 18"
Junior120 to 150cm18.25 to 18.75"
Expert130 to 170cm19.5 to 19.75"
Expert XL145 to 170cm20 to 20.75"
Pro150 to 175cm20.25 to 20.75"
Pro XL165 to 180cm21 to 21.25"
Pro XXL170 to 185cm and up21.5 to 21.85"
Pro XXXL175cm and up22"
Pro XXXXL180cm and up22.5"
Cruiser (24" wheels)175cm and up21.5" and up

Heights overlap between classes on purpose. Where you land in two, a growing rider is usually better on the larger, and a rider who wants the bike to turn faster on the smaller. Some brands label the Pro size Pro L, with the same fit.

Read the full buying guide

Buying a part?
653 products
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Redline MX Expert (2023) / Dark Grey/Blue Gloss / 19.5TT
Redline MX Expert Bike

$949.99 AUD

Dark Grey/Blue Gloss
19.5
Sold out
Radio Valac 20 inch Bike (2021) / Black/White Fade / 20.75TT
Radio Valac 20 inch Bike

$999.99 AUD

Black/White Fade
20.75
A Radio Fiend 26 Inch Bike in turquoise, featuring a 6061-T6 alloy frame, black wheels, disc brakes, and a straight handlebar, is shown in profile on a white background.
Radio Fiend 26 Bike (2021) / Candy Blue / 22.3TT
A blue Radio Fiend 26 Inch Bike with front suspension, disc brakes, flat handlebars, and knobby tires is displayed against a white background.
Close-up of the Radio Fiend 26 Inch Bike frame in blue, crafted from strong 6061-T6 alloy, highlighting the crank arm, pedal, and rear tire on this dirt jump bike.
Close-up of the Radio Fiend 26 Inch Bike's blue rear wheel, featuring gears, derailleur, chain, disc brake rotor, and part of its 6061-T6 alloy frame.
Close-up view of the 6061-T6 alloy frame and handlebars on a blue Radio Fiend 26 Inch Bike against a white background.
Close-up of the Radio Fiend 26 Inch Bike's front wheel with a "Radiobikeco" tire, black fork, and visible brake cables—showcasing durable 6061-T6 alloy construction for quality dirt jump performance against a white background.
Close-up of the blue Radio Fiend 26 Inch Bike, featuring its handlebars, fork, cables, and part of the front tire labeled "RADIO," all constructed on a durable 6061-T6 alloy frame.
Close-up of the Radio Fiend 26 Inch Bike’s blue 6061-T6 alloy frame, chain, crank, and pedal on a white background. The “RADIOBIKECO.” branding is featured on the durable frame.
Close-up of the rear section of the Radio Fiend 26 Inch Bike in blue, featuring a black seat and seat post, sturdy 6061-T6 alloy frame, and rear wheel with distinctive tread and white lettering on the tire.
Close-up of the front wheel on the Radio Fiend 26 Inch Bike, highlighting its disc brake system, rotor, and spokes on a 6061-T6 alloy frame against a white background.
Close-up of a black crank arm and flat pedal attached to the chainring and turquoise 6061-T6 alloy frame of the Radio Fiend 26 Inch Bike, with part of the rear wheel visible.
Close-up of the Radio Fiend 26 Inch Bike's handlebar and stem on a turquoise 6061-T6 alloy frame, highlighting brake cables and headset details against a white background.
A side view shows the teal Radio Fiend 26 Inch Bike with a 6061-T6 alloy frame, black handlebars, seat, and tires. This dirt jump bike includes front suspension and disc brakes.
A teal Radio Fiend 26 Inch Bike with a 6061-T6 alloy frame, front suspension, flat handlebars, disc brakes, and knobby tires is displayed on a white background.
Close-up of the Radio Fiend 26 Inch Bike's rear wheel, showcasing the derailleur, chain, cassette, and a section of its turquoise alloy BMX frame.
Close-up of the Radio Fiend 26 Inch Bike's black seat, seat post, and rear tire, showcasing its durable 6061-T6 alloy frame against a white background—ideal for dirt jump riders.
Close-up of the Radio Fiend 26 Inch Bike’s rear wheel, showcasing the disc brake, caliper, chain, and teal frame—a top pick for fans of alloy BMX or dirt jump bikes.
Close-up of the handlebars, brake levers, and front section of the Radio Fiend 26 Inch Bike in turquoise alloy set against a white background.
Radio Fiend 26 Inch Bike

$1,499.99 AUD

Candy Blue
Teal
22.3
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Radio Comrad 20 inch Bike / Matt Black / 21TT
The Radio Comrad 20 inch BMX bike features a full Cromoly frame, thick tires, a straight handlebar, and a padded seat. It is angled to the right on a white background for an image of durability and precision.
Close-up of a black bicycle seat attached to the sleek full cromoly frame of a Radio Comrad 20 inch Bike, with "Radio" visible on the seat.
Close-up of the Radio Comrad 20 inch BMX bike handlebar with a colorful stem, black grips, and a black front wheel, highlighting the precision of the Salt Integrated Headset.
A close-up of the black front wheel with visible spokes and axle highlights the blue and white branding on the fork, perfectly complementing the rugged Radio Comrad 20 inch Bike design.
Close-up of the Radio Comrad 20 inch bike's black front wheel with a textured tire, spokes, and fork, featuring the high-quality Salt Integrated Headset.
Close-up of a Radio Comrad 20 inch Bike wheel featuring black spokes, rim, and tire, with brand details on the hub and the chain visible in the background.
Close-up of a Radio Comrad 20 inch Bike's black frame featuring a vibrant blue and purple stem clamp, highlighting its full Cromoly frame that seamlessly connects the handlebars.
A close-up of the Radio Comrad 20 inch Bike crankset shows a colorful chainring, a full Cromoly frame, and a black chain. The "RADIOBIKECO" branding is prominently featured, complemented by a Salt Integrated Headset for seamless performance.
Close-up of a black Radio Comrad 20 inch Bike wheel, highlighting the spokes, hub, and tire, all supported by a sturdy full Cromoly frame for optimal performance.
Close-up of a Radio Comrad 20 inch Bike handlebar featuring a colorful, splattered stem design on a black metal frame.
Close-up of black BMX handlebars with textured grips and a colorful stem, showcasing the Salt Parts on the Radio Comrad 20 inch Bike.
Close-up of a black pedal attached to the crank arm of the Radio Comrad 20 inch Bike, with part of its BMX tire visible.
Side view of a black Radio Comrad 20 inch Bike featuring thick tires, upright handlebars, full chromoly frame, and padded seat on a white background.
Radio Comrad 20 inch Bike

$1,349.99 AUD

Matt Black
Matte Black/Dark Silver
21
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Mongoose Title Pro Bike / Black
Mongoose Title Pro Bike

$549.99 AUD

Black
20.75
Sold out
Mongoose Title Mini Bike / Black
Mongoose Title Mini Bike

$549.99 AUD

Black
17.5
Sold out
Mongoose Title Micro Bike / Black
Mongoose Title Micro Bike

$549.99 AUD

Black
16.5
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Mongoose Title Expert Bike / Black
Mongoose Title Expert Bike

$549.99 AUD

Black
19.5
Sold out
Mongoose Title Elite Pro XXL Bike (FY22) / Black
Mongoose Title Elite Pro XXL Bike

$849.99 AUD

Black
21.75
Sold out
Mongoose Legion LXS 20 Inch Bike / Red
Mongoose Legion LXS 20 Inch Bike

$389.99 AUD

Red
18.2
Sold out
Mongoose Legion L80 20 Inch Bike / Tan
Mongoose Legion L80 20 Inch Bike / Blue
Mongoose Legion L80 20 Inch Bike

$649.99 AUD

Tan
Blue
20.75
Sold out
Mongoose Legion L60 20 Inch Bike / Blue
Mongoose Legion L60 20 Inch Bike / Teal
Mongoose Legion L60 20 Inch Bike

$599.99 AUD

Blue
Teal
20.5
Sold out
Mongoose Legion L500 20 Inch Bike / Black
Mongoose Legion L500 20 Inch Bike

$849.99 AUD

Black
21
Sold out
Mongoose Legion L40 20 Inch Bike / Black
Mongoose Legion L40 20 Inch Bike / Purple
Mongoose Legion L40 20 Inch Bike

$529.99 AUD

Black
Purple
20.5
Sold out
Mongoose Legion L20 20 Inch Bike / Green
Mongoose Legion L20 20 Inch Bike

$469.99 AUD

Green
20.25
Sold out
Mongoose Legion L16 16 Inch Bike / Green
Mongoose Legion L16 16 Inch Bike

$399.99 AUD

Green
15.3
Sold out
Kink Gap FC 20 Inch Bike (2023) / Gloss Chrome Plated / 20.5TT
Kink Gap FC 20 Inch Bike (2023)

$829.99 AUD

Gloss Chrome Plated
20.5
Sold out
The Kink Gap 20 Inch Bike, featuring a black BMX design with thick tires, a semi-chromoly frame, and a black padded seat, side view.
A Kink Gap 20 Inch BMX bike featuring a white frame, black wheels, a brown seat, black handlebars, and a sturdy semi-chromoly construction.
The Kink Gap 20 Inch Bike in matte black showcases Kink Ridge three-piece cranks and a semi-chromoly frame, complemented by knobby tires and high handlebars set against a dark background.
The Kink Gap 20 Inch Bike, with its semi-chromoly light gray frame, brown seat, black handlebars, and thick black tires, is displayed against a dark background.
The stylish design of the Kink Gap 20 Inch Bike, featuring a semi-chromoly frame and robust tires, stands out vividly against a dark background.
The Kink Gap 20 Inch Bike boasts a stylish white semi-chromoly frame, complemented by black wheels and a brown seat, making it an ideal choice for beginner riders against a dark backdrop.
Close-up of a black bicycle crankset featuring a chainring, pedal, and chain on the Kink Gap 20 Inch Bike's semi-chromoly frame, branded with "Kink Ridge" Three Piece Cranks.
Detailed view of the crankset and pedal assembly on a Kink Gap 20 Inch Bike, highlighting the black chainring and pedal against its semi-chromoly frame.
Close-up of a brown bike seat from the Kink Gap 20 Inch Bike, featuring embossed branding and stitching detail, mounted on its sleek semi-chromoly frame.
Close-up of the Kink Gap 20 Inch Bike wheel, showcasing a black, textured tire with sleek Mission X7 rims and metal spokes.
Close-up of a BMX handlebar stem in black featuring the "Kink BMX" logo and secured with four bolts, making it an excellent choice for the Kink Gap 20 Inch Bike. This stem is ideal for novice riders, as it beautifully complements the semi-chromoly frame.
Close-up of a handlebar on the Kink Gap 20 Inch Bike, showcasing a textured grip design and a brake lever, seamlessly paired with Mission X7 Rims for an improved riding experience.
Kink Gap 20 Inch Bike
$799.99 AUD
Midnight Black
Terrazzo White
20.5
Sold out
Kink Cloud 20 Inch Bike (2023) / Matte Iridescent Black / 21TT
Kink Cloud 20 Inch Bike

$1,299.99 AUD

Matte Iridescent Black
21
Sold out
Inspyre EVO Junior Disc Brake Bike / Grey / 18.75TT
Inspyre EVO Junior Disc Brake Bike

$1,194.99 AUD

Grey
18.75
Sold out
Fit Bike Co Prk Bike (2023) / Grey / 20TT
Fit Bike Co Prk Bike (2023) / Teal / 20TT
Fit Bike Co Prk Bike (2023) / Gloss Black / 20.5TT
Fit Bike Co Prk Bike (2023) / 90's Pink / 20.5TT
Front view of the Fit Prk 20 Inch Bike (2023) in teal, featuring handlebars, front wheel, black pedals, and part of the frame with sealed bearings shown against a white background.
Front view of a Fit Prk 20 Inch Bike (2023) with a black frame, pink handlebars, sealed bearings, and the front tire facing directly forward.
Close-up of the drivetrain on a teal Fit Prk 20 Inch Bike (2023), showing the chain, pedals, crankset with sealed bearings, rear wheel, and brake cable.
Close-up view of the Fit Prk 20 Inch Bike (2023) in pink, showing its frame, rear wheel, pedals, chain, and sealed bearing crankset.
Fit Prk 20 Inch Bike (2023)
$799.99 AUD
Grey
Teal
Gloss Black
90's Pink
2020.5
Sold out
Fiend Type O XL Bike (2020) / Gloss Black
Fiend Type O XL Bike (2020)

$699.99 AUD

Gloss Black
21
Sold out
Fairdale Ridgemont 27.5 Bike (2022) / Gloss Black / S/M
Fairdale Ridgemont 27.5 Inch Bike (2022)

$999.99 AUD

Gloss Black
S/M
Sold out
DK Zenith Pro L Bike / Black / 20.5TT
DK Zenith Pro L Bike

$2,199.99 AUD

Black
20.5

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