The Quartz from RADIO RACELINE is a hydroformed 6061 aluminium BMX race frame, offered here in all sizes from Expert to Pro XXXXL. The current Pro version (Black, Spectral Space Green, Spectral Abyss Purple) is disc-specific with the Sliding Dropout Disc System (SDDS) and internal cable routing. Earlier versions and colours (e.g. Matt Black, Spectral Silver, Metallic Copper) are listed as separate colour variants.

Features (current Pro version)

• Disc-specific frame with internal cable routing
• Forged, CNC-machined Sliding Dropout Disc System (SDDS) with integrated chain tensioner
• Hydroformed 6061 alloy with Paradigm tubing
• Flat-mount disc brake only; designed for 120 mm and 140 mm rotors

Specifications (current Pro version)

• Material: Hydroformed 6061 aluminium, Paradigm tubing
• Wheel size: 20" (406 mm) x 1.75"
• Head tube: Tapered 1-1/8"–1.5" integrated
• Bottom bracket: BSA, 68 mm
• Seat post: 27.2 mm (seat clamp 31.8 mm ID)
• Dropouts: SDDS sliding dropouts for 10 mm and 15 mm axles
• Brakes: Flat-mount disc only (no V-brake mounts)

Sizes (top tube)

• Expert 19.5" · Expert XL 20.2"
• Pro 20.5" · Pro L 20.9" · Pro XL 21.25" · Pro XXL 21.75" · Pro XXXL 22.25" · Pro XXXXL 22.5"

Availability of colours differs by size – see the variant selection.