Two blue and one black Radio Raceline Helium 2027 Expert Frames, made from hydroformed 6061 alloy, are arranged diagonally and overlapping on a white background to highlight their lightweight race-ready design.

A black Radio Raceline Helium 2027 Expert Frame, made from hydroformed 6061 alloy, is displayed on a white background with "HELIUM" and "RADIO" labels, shown without any additional components.

Radio Raceline Helium 2027 Expert Frame in blue shown from the side, crafted from hydroformed 6061 alloy for a lightweight race build. Visible mounting points; no wheels, fork, or components attached.

A side view of the Radio Raceline Helium 2027 Expert Frame in light blue and purple hydroformed 6061 alloy with black text, set against a white background.

Highlights

Hydroformed 6061 alloy tubing
19.5" top tube, 13" chainstays
SDDS sliding dropouts
Flat mount disc or V-brake

Description

The Radio Helium frame has been out on track now for several years, with each year seeing the brand steadily improving this frame. For 2027 the colours and graphics have definitely taken on a clean look, with solid colourways and bold Radio decals on the down tube.

Technically, the frame is manufactured from industry trusted hydroformed 6061 alloy tubing, which produces a super lightweight race frame that is strong enough to take on the big tracks and high speeds they produce. Even the youngest racers need a frame that can take on 5m hill and everything that follows on from it.

The Radio Helium frame has proved over the past 5 races seasons that they can not only produce race wins, they are built to a standard where you can trust it with touches like a forged (read strong) dropout that can integrate Radio's disc mount. Or if you're running V-brakes, then Radio has you covered here as well. You have the choice.

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

Features:
• 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 (Choose from 10mm or 15mm dropout adapters)
• 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" x 1 3/8 tyres (451mm)

Specifications:
Toptube Length: 19.5” (495mm)
Chain Stay Length (Min): 13” (330mm)
Rider Area: 19.8" (503mm)
Head Tube Angle: 73.5°
Seat Tube Angle: 71°
BB Height: 10.8" (274mm)
Seat Tube Height: 8.42" (214mm)
Wheel Size: 20" x 1-3/8” (451mm)
Head Tube Size: 1 1/8" for integrated headset
Seat Post Size: 22.2mm
Seat Clamp Size: for 25.4mm ID seat clamp
Tubing: Hydroformed 6061 alloy
Bottom Bracket: BSA, 68mm wide
Head Tube: 4.72" (120mm)
Dropouts: Sliding dropout disc system (SDDS)
Brakes: Flat mount disc brake or v-brake mounts (removable), 77mm pivot-to-pivot
Weight: 1.54kg (3.39 lbs)

Features

Hydroformed 6061 alloy tubing. 1540g of light, strong race frame, built to hold speed on the big tracks.
19.5" top tube, 13" chainstays. Expert race fit with a 19.8" rider area, a 73.5° head angle and a 71° seat angle.
SDDS sliding dropouts. Take 10 or 15mm axles and include all the hardware, so you can set the rear end where you want it.
Flat mount disc or V-brake. V-brake mounts are removable at 77mm pivot to pivot, so take them off once you commit to disc.
Built around standard race fittings. 20" x 1-3/8" wheels, a BSA 68mm bottom bracket and a 1-1/8" integrated head tube, so parts drop straight in.

Specifications

Top tube: 19.5" (495mm)
Chainstay: 13" (330mm) minimum
Head tube angle: 73.5°
Seat tube angle: 71°
Bottom bracket height: 10.8" (274mm)
Bottom bracket: BSA, 68mm wide
Tubing: Hydroformed 6061 alloy
Dropouts: Sliding dropout disc system (SDDS) for 10 and 15mm axles, includes all hardware
Brake mounts: Flat mount disc brake or removable V-brake mounts, 77mm pivot to pivot
Head tube: 4.72" (120mm), 1-1/8" for integrated headset
Seat tube: 8.42" (214mm), 22.2mm seat post
Seat clamp: For 25.4mm ID seat clamp
Axle: 10 or 15mm
Wheel size: 20" x 1-3/8" (451mm)
Weight: 1540g (1.54kg)
Note: Rider area 19.8" (503mm)

Radio Raceline Helium 2027 Expert Frame

Name: Radio Raceline Helium 2027 Expert Frame
Brand: Radio Raceline
SKU: RAFR102-23-PUR
Price: 799.99 AUD
Availability: OutOfStock

Brand: Radio Raceline SKU: Click to copy the SKU and show the pick location

$799.99 AUD

Or 4 payments of $199.99 AUD with

Colour - Galactic Ice Purple

Top Tube Length - 19.5

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 110cm	16.25"
Mini (20" wheels)	110 to 125cm	17 to 18"
Junior	120 to 140cm	18.25 to 18.75"
Expert	135 to 155cm	19.5 to 19.75"
Expert XL	150 to 165cm	20 to 20.75"
Pro	160 to 170cm	20.25 to 20.75"
Pro XL	165 to 175cm	21 to 21.25"
Pro XXL	170 to 185cm and up	21.5 to 21.85"
Pro XXXL	175 to 185cm and up	22"
Pro XXXXL	185cm and up	22.5"
Cruiser (24" wheels)	175cm and up	21.5" and up

Heights overlap between bike sizes on purpose. If you fall in two size categories, a growing rider new to racing is usually better suited to the larger bike, a experienced rider who wants the bike to more responsive should err on the smaller size. 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. Just don't guess their height either, you know how fast they can grow!

Here are some tips

Between two sizes and still growing? Take the larger size, but make sure you check the top tube length of the bike. The length of top tube for a given size (Expert XL as an example) can vary up to a half inch or more across brands. Most Expert XL frames are 20", but we've seen them as long as 20.7"
Experienced racer and wanting the bike to be more responsive? Take the smaller size. You want the bike to be "under you", not a stretch to the bars and cranks.
Top tube is the number that actually changes the fit, so compare it against the bike they ride now.

Still not sure? We're the experts and size bikes for riders every day of the week. Our team has decades of experience between them and will help you decide which bike is the right fit based on rider height and racing experience.

Read the full buying guide

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 110cm	16.25"
Mini (20" wheels)	110 to 125cm	17 to 18"
Junior	120 to 140cm	18.25 to 18.75"
Expert	135 to 155cm	19.5 to 19.75"
Expert XL	150 to 165cm	20 to 20.75"
Pro	160 to 170cm	20.25 to 20.75"
Pro XL	165 to 175cm	21 to 21.25"
Pro XXL	170 to 185cm and up	21.5 to 21.85"
Pro XXXL	175 to 185cm and up	22"
Pro XXXXL	185cm and up	22.5"
Cruiser (24" wheels)	175cm and up	21.5" and up

How to measure

Here are some tips

Between two sizes and still growing? Take the larger size, but make sure you check the top tube length of the bike. The length of top tube for a given size (Expert XL as an example) can vary up to a half inch or more across brands. Most Expert XL frames are 20", but we've seen them as long as 20.7"
Experienced racer and wanting the bike to be more responsive? Take the smaller size. You want the bike to be "under you", not a stretch to the bars and cranks.
Top tube is the number that actually changes the fit, so compare it against the bike they ride now.

Read the full buying guide

Radio Raceline Helium 2027 Expert Frame - Galactic Ice Purple / 19.5