RADIO RACELINE Helium Pro Sizes 2025 Frames

The Helium Frame took the race world by storm when it was released almost 5 years ago. With multiple World Championship wins, the Helium Frame is now a common site on tracks across the globe. 

• Super lightweight alloy race frame
• Hydroformed 6061 alloy tubing
• Forged & CNC machined dropouts
• Forged and CNC machined Sliding Dropout Disc System (SDDS) with integrated chain tensioner
• Flat mount disc brake (with internal cable routing) and v-brakes (external routing)
• Designed for 140mm and 120mm rotors (please check 120mm rotor fitment with an authorised Radio Bikes dealer based on your hub and brake calliper dimensions)
• Integrated chain tensioner bolts
• For 20” (406mm) x 1.75” tyres

Specifications
Material - Hydroformed 6061 alloy
Top Tube Length (effective)
L – 20.9” (531mm)
XL – 21.25” (540mm)
XXL – 21.75” (552mm)
XXXL – 22.25” (565mm)
XXXXL - 22.5" (571.5mm)
Chain Stay Length (min)
L – 13.9” ( 353mm)
XL – 14.5” (368mm)
XXL/XXXL – 14.8" (376mm)
XXXXL - 15.2" (386mm)
Dropout Size – Sliding dropout disc system (SDDS) for 10 & 15mm axles (includes all hardware)
Head Tube Angle - 74°
Seat Tube Angle - 71°
Head Tube Size (full int.) – Tapered 1-1/8” – 1.5” (125mm)
Seat Post Size – 27.2mm
Seat Tube Length – 231mm
Bottom Bracket Height – EU, 11.6”
Wheel Size – 20 x 1.75”
Brakes - Flat mount disc brake AND V-brake mounts (removable),88mm pivot-to-pivot
Rider Area
L – 532.6mm
XL – 540.7mm
XXL – 551.9mm
XXXL – 564.2mm
XXXXL - 570.9mm
Weight
L – 1.74kg
XL – 1.82kg
XXL – 1.84kg
XXXL – 1.85kg
XXXXL - 1.86kg