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

New sliding disc dropouts. The 2026 Quartz Disc frame runs flat mount brakes, sliding forged dropouts with integrated chain tensioners and stealth cable routing.
Six world championships on this frame. Hydroformed 6061-T6 alloy that has proven itself at the top level, so it holds its own against carbon.
Full pro parts kit. Arise Xenon Pro 175mm 2pc cranks, Bravo fully sealed hubs, tubeless ready Argon Pro rims and a 16T sealed cassette driver.
Tioga Fastr tyres, 1.75 front, 1.6 rear. Wider up front for grip off the gate, narrower out back for speed down the straight.
29" Neon Pro race bars. Butted and heat treated chromoly with 8.5" rise and 6.5° backsweep, clamped in a 54mm CNC toploader stem.

Specifications

Size: Pro XXL
Frame: Radio Raceline Quartz Disc, hydroformed 6061-T6 alloy, tapered head tube, sliding forged dropouts with integrated chain tensioners, flat mount disc
Top tube: 21.75"
Chainstay: 15.25"
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, 29" wide, 8.5" 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 2pc, cold forged and CNC alloy, 175mm, 24mm spindle
Bottom bracket: Radio Raceline BSA 24, external bearing cups, CNC machined, sealed
Sprocket: Arise Xenon Pro Pro XL/XXL 44T, 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
Tyres: Tioga Fastr, front 20" x 1.75", rear 20" x 1.6"
Gearing: 44/16

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 XXL Bike (2026)

Name: Radio Quartz Pro XXL Bike (2026)
Brand: BMX International
SKU: RABK248-26-GRY
Price: 2799.99 AUD
Availability: InStock

Brand: BMX International SKU: Click to copy the SKU and show the pick location

$2,799.99 AUD

Or 4 payments of $699.99 AUD with

Colour - Dark Blue Grey Metallic

Top Tube Length - 21.75

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

Size	Rider height	Top tube
Micro (18" wheels)	Under 120cm	16.25"
Mini (20" wheels)	110 to 140cm	17 to 18"
Junior	120 to 150cm	18.25 to 18.75"
Expert	130 to 170cm	19.5 to 19.75"
Expert XL	145 to 170cm	20 to 20.75"
Pro	150 to 175cm	20.25 to 20.75"
Pro XL	165 to 180cm	21 to 21.25"
Pro XXL	170 to 185cm and up	21.5 to 21.85"
Pro XXXL	175cm and up	22"
Pro XXXXL	180cm and up	22.5"
Cruiser (24" wheels)	175cm and up	21.5" 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