The Radio Quartz Pro Bike (2026) is a gray BMX-style bike with an aluminum Quartz frame, black handlebars, seat, and wheels, shown from the side on a white background—ideal as a lightweight alloy race bike.
Radio Quartz Pro L Bike (2026) - supplier product photo
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Description

Based upon Radio's headlining aftermarket aluminium Quartz frame, their complete race bike is ready to win straight out of the box. This frame has seen six world championships and is constructed from super-lightweight alloy with no details spared.

Radio's designers took this frame and draped it in only the very best components, creating a full PRO build that will hold its own in any level of competition. This alloy frame is no poor cousin to any carbon frames, it's a legit title contender. 

New for 2026, the Quartz Disc frame features the new sliding disc dropouts with flat mount brakes and super stealthy cable routing.

Features
  • Six-time world championship frame. The Quartz Disc frame is hydroformed 6061-T6 alloy, super light, with a tapered head tube and forged sliding dropouts.
  • New sliding disc dropouts. Flat mount disc brakes, internal chain tensioners and stealthy cable routing keep the back end tidy and chain tension easy to set.
  • Pro L race geometry. A 20.9" top tube, 74° head tube angle, 71° seat tube angle, 11.6" bottom bracket height and 14.25" chainstays.
  • Full Arise component kit. Arise Neon Pro toploader stem, Xenon Pro 2-piece cranks on a 24mm spindle, sealed Bravo hubs and tubeless ready Argon Pro alloy rims.
  • 43T to 16T race gearing. An alloy Xenon Pro sprocket and sealed 16T cassette driver joined by a KMC Z1eHX chain, rolling on Tioga Fastr tyres.

Specifications
  • Size: Pro L, 20" wheels
  • Frame: Radio Raceline Quartz Disc, lightweight hydroformed 6061-T6 alloy, tapered head tube, sliding forged dropouts with internal chain tensioners, flat mount disc brake
  • Top tube: 20.9"
  • Chainstay: 14.25"
  • Head tube angle: 74°
  • Seat tube angle: 71°
  • Bottom bracket height: 11.6"
  • Fork: Radio Raceline alloy, 20mm offset
  • Headset: Radio Raceline Pro integrated, sealed, threadless, 1-1/8" to 1.5"
  • Stem: Arise Neon Pro toploader, 54mm extension, CNC machined, alloy
  • Bars: Radio Raceline Neon Pro hydroformed, multiple butted and heat-treated chromoly, 28" wide, 7.5" rise, 2.5" upsweep, 6.5° backsweep
  • Grips: Radio Raceline Xenon, diamond knurling, clamp-on, 139mm
  • Brakes: Arise Race rear flat-mount disc calliper
  • Brake lever: Arise Race
  • Cranks: Arise Xenon Pro 2-piece, cold forged and CNC, alloy, 175mm, 24mm spindle
  • Bottom bracket: Radio Raceline BSA 24 set, external bearing cups, CNC machined, sealed
  • Sprocket: Arise Xenon Pro PRO XL/XXL, 43T, alloy, with alloy chainring bolts
  • Chain: KMC Z1eHX, 1/2" x 3/32"
  • Pedals: Radio Raceline Xenon Slim, alloy
  • Front hub: Arise Bravo, CNC alloy, fully sealed, 36h, 3/8" female chromoly axle
  • Rear hub: Arise Bravo, CNC alloy, fully sealed, 36h, disc brake cassette, 6 pawl, 3/8" female chromoly axle
  • Rear cog: Radio Raceline driver, 16T, 1/2" x 3/32", sealed cassette
  • Spokes: Stainless
  • Rims: Arise Argon Pro, flash welded, 36h, tubeless ready, alloy, front and rear
  • Tyres: Tioga Fastr, front: 20" x 1.75", rear: 20" x 1.6"
  • Gearing: 43T sprocket, 16T driver

Assembly information

Your race 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
  • Spin the rear wheel and check the rotor runs clear of the calliper
  • Check the brake and tyre pressure before the first ride

Disc brakes: keep your fingers off the rotor and pads, because oil from your skin contaminates the braking surface and takes the bite away. If the rotor rubs, loosen the two calliper bolts, squeeze the lever, then tighten them again with the lever held on. Bed the brake in with a few firm stops before you race it.

Tools: Allen key set and a 15mm spanner for the pedals. Check your axle hardware, since race bikes vary between bolt-on nuts and a thru-axle.

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 Quartz Pro L Bike (2026)

Brand: Radio Raceline SKU:

$2,799.99 AUD

Or 4 payments of $699.99 AUD with

Colour - Dark Blue Grey Metallic

Top Tube Length - 20.9

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.

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 two sizes and still growing? Take the larger size.
  • Racing gates and wanting the bike to turn faster? Take the smaller size.
  • Top tube is the number that actually changes the fit, so compare it against the bike they ride now.

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

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.

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 two sizes and still growing? Take the larger size.
  • Racing gates and wanting the bike to turn faster? Take the smaller size.
  • Top tube is the number that actually changes the fit, so compare it against the bike they ride now.

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

Read the full buying guide
$2,799.99 AUD

Price match request

Radio Quartz Pro L Bike (2026) - Dark Blue Grey Metallic / 20.9

Metro bike shipping from $59.99

Regional and remote rates may differ

Free in-store pickup - Brisbane

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