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?
651 products
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Fiend Type B 20 Inch Bike / Gloss Clear Phosphate / 20.75TT
Fiend Type B 20 Inch Bike

$719.99 AUD

Gloss Clear Phosphate
20.75
Save $29.00
The Kink Kicker 18 Inch Bike (2027), a white kids BMX with black seat, handlebars, and tires, is displayed in side view against a plain background—ideal for those looking for an 18 inch BMX. The Kink Kicker 18 Inch Bike (2027) is a white kids BMX bike with black handlebars, seat, and tires, displayed from a slight angle on a plain white background.
Kink Kicker 18 Inch Bike (2027)

$719.99 AUD

$748.99 AUD

Glacier White
18
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The Fit Bike Co Nightwolf 20 Inch Bike is a limited edition gold chromoly BMX with black handlebars, seat, and tires, plus yellow wheel rims and a single gear—ideal for Nightwolf fans and shown against a white background. The Fit Bike Co Nightwolf 20 Inch Bike is a limited edition gold BMX with a black seat, handlebars, and tires, yellow wheel rims, and minimal branding—no extra accessories or decals beyond the brand logo on the frame.
Fit Bike Co Nightwolf 20 Inch Bike

$1,399.99 AUD

Tan
21
Fit Bike Co Flow 20 Inch BMX bike in olive green with tan seat, black handlebars, and thick tires; shown in profile on a white background—ideal for dirt jumps and your next biking adventure. A Fit Bike Co Flow 20 Inch bike in brown with black handlebars, seat, pedals, and tires is displayed side view against a white background.
Fit Bike Co Flow 20 Inch Bike
$1,099.99 AUD
Matte Green
Terra Brown
Chrome Plated
2121.25
The Colony Premise 20 Inch Bike, a blue chromoly BMX with black handlebars, seat, and double-wall rim wheels, is shown against a white background. Close-up of the handlebars and front section of the Colony Premise 20 Inch Bike, featuring black grips, a brake lever, and part of the blue chromoly frame against a white background.
Colony Premise 20 Inch Bike

$1,099.99 AUD

Blue
20.8
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The DK Swift Junior 20 Inch Bike 2025, a black BMX bike with a straight top tube, front and rear hand brakes, all-terrain tires, and yellow and white graphics on its lightweight aluminum frame, is shown in profile against a white background.
DK Swift Junior 20 Inch Bike 2025

$699.99 AUD

Black
18.25
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The DK Step Up 14 Inch Bike is a black kids BMX with red-rimmed wheels, black handlebars, a "STEP UP" logo on the top tube, and a lightweight aluminum frame, shown on a white background. A DK Step Up 14 Inch Bike in purple, featuring a lightweight aluminum frame, black tires, seat, and handlebars, is shown from the side against a white background.
DK Step Up 14 Inch Bike

$569.99 AUD

Black/Red
Purple
15.5
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The Kink Coast 12 Inch Balance Bike (2026) features a sleek dark metallic frame and sturdy black wheels, set against a clean white background. It's the perfect introduction to biking for budding BMX enthusiasts. A compact purple Kink Coast 12 Inch Balance Bike (2026) with thick tires effortlessly leans against a textured gray brick wall on concrete, embodying its rugged style.
Kink Coast 12 Inch Balance Bike (2026)

$399.99 AUD

Galaxy Grey
12
Wethepeople CRS FC 20 Inch Bike / Matte Trans Blue / 20.25TT Wethepeople CRS FC 20 Bike / Matt Black / 20.25TT
Wethepeople CRS FC 20 Inch Bike

$999.99 AUD

Trans Berry Blast
Matt Black
Matte Trans Blue
Dark Graphite
20.25
Sold out
The Fly Bikes Neutron 20 Inch Bike, a Ruben Alcantara signature model, boasts a sleek black design with thick tires and a sturdy CrMo frame. Its compact structure and front brake cable stand out beautifully against the white background. The Fly Bikes Neutron 20 Inch Bike, showcasing a beige CrMo frame complemented by black handlebars, seat, and wheels, is displayed against a white background and comes equipped with the reliable Springhanger brake system.
Fly Bikes Neutron 20 Inch Bike

$979.99 AUD

Flat Black
Flat Grey
Right Hand Drive - 20.75Left Hand Drive - 20.75
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A purple Wethepeople Trust 20 Inch Cassette/Hybrid BMX bike with black tires, straight handlebars, padded seat, and "WeThePeople" on the frame is shown against a white background. A black Wethepeople Trust 20 Inch Cassette/Hybrid Bike with thick tires, padded seat, straight handlebars, and "We The People" on the frame is shown in side profile against a white background.
Wethepeople Trust 20 Inch Cassette Bike

$1,599.99 AUD

Matte Trans Purple
21
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The Meybo 2025 Clipper Pro XXL is a BMX race bike with a purple and blue frame, thick tires, a small seat, and a single gear. The Meybo 2025 Clipper Pro XXL BMX race bike features a gradient red to purple frame, black handlebars, seat, and wheels, along with a visible chain and pedals. Designed for speed and style on the track.
Meybo 2025 Clipper Pro XXL Bike

$1,499.99 AUD

Purple/Navy
Red/Maroon
22
Save $40.00
The Sunday Primer 16 Inch Bike (2025) in teal is a BMX bike designed for children, featuring black handlebars, pedals, and tires. Its simple frame design and robust chain drive system ensure reliability, while the Odyssey Springfield Brakes provide superior stopping power for safe riding. The Sunday Primer 16 Inch Bike (2025), featuring a teal frame, black seat, black handlebars, and thick tires with Pro-Style Geometry, is parked on a concrete surface.
Sunday Primer 16 Inch Bike (2025)

$799.99 AUD

$839.99 AUD

Turquoise
16.5
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Chase Element Pro XXXL Bike *scratch and dent* shown from a front angle on a white background, featuring red frame with black handlebars, seat, and tires plus Ikon carbon forks. The Chase Element Pro L Bike is a black BMX bike with a sleek design, featuring thick tires, a sturdy frame, and a raised handlebar. This model includes Ikon carbon forks for enhanced performance, as well as a chain guard and foot pegs on both the front and rear wheels.
Chase Element Pro XXL Bike

$2,198.99 AUD

Black/Grey
Wine/Sand
21.5
Sold out
The Radio Quartz Pro XXL Bike 2025, a black BMX bicycle featuring a sleek, lightweight hydro-formed frame, straight handlebars, and thick tires, is shown against a white background. The Radio Quartz Pro XXL Bike 2025 is a black BMX bicycle featuring a robust, hydro-formed frame, wide handlebars, and knobby tires. It boasts a single gear chain drive and Radio Raceline Quartz Pro XL branding on both the frame and tires.
Radio Quartz Pro XXL Bike 2025

$2,599.99 AUD

Matte Black
21.75
Side view of a blue Radio 16 Inch Zuma Bike, featuring thick tires, disc brakes, and a straight handlebar on a white background. Text below notes that the product may vary in appearance. A blue Radio 16 Inch Zuma Bike, featuring thick black tires, black handlebars, and a black seat, displayed on a white background.
Radio 16 Inch Zuma Bike
$899.99 AUD
Cyan Blue
Green
Blue Grey Metallic
Bright Mint Metallic
14.75
Sold out
A black and red Radio Xenon Mini Bike on a white background. A black and red Radio Xenon Mini Bike race bike on a white background.
Radio Xenon Mini Bike

$999.99 AUD

Black/Red
Black/Green
17.5
Sold out
A yellow and black Inspyre EVO-C Junior Disc Brake Bike with a carbon fork on a white background.
Inspyre EVO-C Junior Disc Brake Bike

$1,738.99 AUD

Mystic Honey Gold Chrome
18.75
Sold out
A BMX bike with a metallic bronze frame, black handlebars, and black wheels, shown in a side profile view. This sleek Kink Williams 20 Inch Bike captures the essence of Nathan Williams' signature style perfectly. Kink Williams 20 Inch Bike (2023) / Matte Forge Blue / 21TT
Kink Williams 20 Inch Bike
$1,499.99 AUD
Matte Forge Blue
Mojave Bronze
21
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Inspyre EVO Pro Cruiser Disc Brake Bike / Grey / 21.85TT
Inspyre EVO Pro Cruiser Disc Brake Bike

$1,302.99 AUD

Grey
21.85
Save $100.00
Fit Bike Co TRL Bike (2023) / Avo Green / 21TT Fit Bike Co TRL Bike (2023) / Saxon Yellow / 21.25TT
Fit TRL Bike (2023)

$999.99 AUD

$1,099.99 AUD

Avo Green
Gloss Black
Nordic Blue
Saxon Yellow
2121.25
Sold out
The Fairdale Taj 27.5 Inch Bike (2022) in blue and black, featuring a chromoly frame, straight handlebar, black saddle, and large tires, is displayed in a side profile against a white background. The Fairdale Taj 27.5 Inch Bike (2022) features a chromoly frame for durability, thick tires, a black seat, and a straight handlebar in an eye-catching teal and black color scheme.
Fairdale Taj 27.5 Inch Bike (2022)

$833.99 AUD

Translucent Winter Blue
23
Sold out
DK Zenith Pro XL Bike / Black / 21TT
DK Zenith Pro XL Bike

$2,399.99 AUD

Black
21
A side-profile of the purple Colony Endeavour Bike BMX features a tough Chromoly frame, black tires, padded seat, and wheel pegs, displayed against a white background. Colony Endeavour Bike / Dark Grey/Silver / 21TT
Colony Endeavour Bike

$1,299.99 AUD

Dark Grey/Silver
Nardo Grey
Purple People Eater
21

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