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Item # RID001B

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Item # RID001B


Every frame company wants to tout that it has the lightest frame in the industry. And yet, constructing an ultra-light frame just to be ogled by blogs and techies doesn't serve much of a purpose unless the ride is also something to behold. Ridley Bikes has constructed the Helium SL, which sits squarely at the front of the market's low-weight road frames. And it's rideable to the Nth degree. 

So how light is light? And, how does it ride? These are the two questions we'll address. Starting with the weight, the SL is a mere 1050grams, frame and fork. With the 300gram fork, this leaves just 750grams for the frame. This was achieved through the use of a sophisticated carbon selection, utilizing a strategic placement of 60, 40, and 30 ton high-modulus carbon fiber. Before the SL, the Helium featured a predominantly 30 ton carbon composition. Why is this important? Well, the 'ton' designation in '60 ton' refers to the carbon's ability to withstand 60 tons of pressure per square millimeter. So, basic logic tells us that a stronger carbon fiber requires less carbon to be used. In addition, on top of the carbon, Ridley bonded a nano resin. This decreased weight and increased strength.

Not surprisingly, Ridley wasn't done yet. To further reduce weight, Ridley constructed the front triangle of the SL with a monocoque design. This means that the entire front triangle (head tube, down tube, seat tube, and bottom bracket lug) is made in one piece. How does this save weight? Well the seatstays, chainstays, and dropouts are bonded to the existing triangle by applying resin and then over-wrapping the bonding points with more carbon fiber. With the SL, this application only occurs once, and you can imagine the added weight of repeating this process at every tube juncture of the frame. Furthermore, Ridley shaved grams by giving the SL a slightly smaller head tube dimension than the Helium, with a 1-1/8 x 1-1/4in tapered design instead of the Helium's 1-1/8 x 1-1/2in.

The SL has also received a new tube shape design. The SL takes its design inspiration from the circle. Yes, the circle. You've probably seen this on the Helium, but the SL does away with the massive, oversized tubing. It features rounded tubing emanating from the seat tube juncture, which slowly becomes box-shaped as it approaches the head tube and bottom bracket junctures. As Ridley puts it, this system creates a clean transition from stiffness to comfort. Supporting this ideology, the rear triangle has been designed to intermix the two. The asymmetric, flat chainstays provide a stiff platform for power transfer to the rear wheel. Meanwhile, the ultra-thin seatstays create a vertically compliant ride quality without sacrificing rigidity.

And on the subject of rigidity, even though it's a lightweight, Ridley says that the SL is actually stiffer than the Helium. To be exact, Ridley's testing has concluded that the SL is 8% stiffer at the bottom bracket, 4% stiffer at the head tube, and the new fork design not only weighs 90 grams less, but it also has a 20% increased side stiffness. How does this translate to speed? In rudimentary terms, ride quality hinges on what's called a stiffness-to-weight ratio, or specific modulus. And while the mathematics behind the determination of specific modulus are too complicated to explain here, it's not a complicated notion to grasp that a frame with low weight and higher stiffness will efficiently transfer power.

Ridley has also made the SL what it calls 'future ready.' This is a fancy way to say that its 100% internal cable routing has been designed to accommodate both electronic and mechanical shift systems. And in the case of the seatpost, the SL's features a 27.2mm post. This moves away from the ever popular integrated seatposts -- saving weight and making packing easier.

The Ridley Helium SL is available in the color Matte black and in five sizes from XX-Small to X-Large.

Tech Specs

Frame Material:
60T, 40T, 30T high-modulus carbon fiber
4ZA carbon
Fork Material:
carbon fiber
Steer Tube Type:
1-1/8 x 1-1/4 tapered
Dropout Type:
Headset Included:
Bottom Bracket Type:
Seatpost Diameter:
27.2 mm
Cable Routing:
Compatible Components:
Shimano, SRAM, Campagnolo
Claimed Weight:
1050 g
Frame-Only Weight:
750 g
Fork Weight:
300 g
Recommended Use:
road cycling
Manufacturer Warranty:
5 years frame

sizing chart

Bike size by rider height


Geometry chart



Geometry Chart


Helium SL
 Seat Tube

Effective Top Tube






Stand Over

Head Tube Length


Head Tube Angle


Seat Tube Angle


Bottom Bracket DropChainstayWheelbase
XS 48.0cm 52.5cm 53.0cm 37.5cm 74.0cm 13.0cm 72.0o 74.0o 6.8cm 40.5cm 97.4cm
S 51.0cm 54.5cm 54.5cm 38.5cm 75.0cm 14.5cm 73.0o 73.0o 6.6cm 40.5cm 97.7cm
M 54.0cm 56.5cm 57.5cm 39.0cm 78.0cm 17.5cm 73.0o 73.0o 6.6cm 40.5cm 99.0cm
L 57.0cm 58.5cm 60.2cm 40.0cm 81.0cm 20.5cm 73.0o 72.0o 6.3cm 40.8cm 100.3cm
XL 60.0cm 60.0cm 62.5cm 40.5cm 84.0cm 23.0cm 74.0o 72.0o 6.3cm 40.8cm 101.2cm

Geometry Chart

Reviews & Community


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Best bike I've ever owned

  • Familiarity: I've put it through the wringer

This frame is awesome. I love Ridley's tall head tube and aggressive yet comfortable geometry. This frame is sooooo comfortable and when you get out of the saddle for big watts it responds with quick acceleration. I can't wait to race it. Bought it at end of season because price is right. I actually feel sorry for those folks who will never get to ride this bike.

UPDATE: Raced the helium sl this past weekend in a kermesse-type race on wet farm roads in Lancaster County, PA. This bike carved the turns beautifully. I felt comfortable leaning this bike hard on the wet payment. The bike climbed with ease and I definitely saw an increase in power on the ascents compared to races on other bikes when I reviewed my Garmin data. This frame is no hype and delivers on comfort, power transfer and superb handling.

Best bike I've ever owned

What is the max wheel width for this frame. I have HED stingers and they are 28mm wide and want to make sure they would fit

Best Answer

The Stingers will work but that's about max. You would have to stick with a 23 or 25c tire depending on brand.

Avg. ride time: 2h 43m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Is the Rear Derailleur Hanger Replaceable?

Are the dropouts carbon or aluminum?

I own this frame. hanger is replaceable. Drop outs are carbon.

Avg. ride time: 14h 42m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Fantastic "Halo" bike buster.

  • Familiarity: I've put it through the wringer

In the contemporary world of cycling, we have a saturation of $20,000 bicycles. Let that sink in. I've ridden many, many bikes priced much MUCH higher than this bike and haven't had half the ride experience. The bike climbs, it descends, it does it all. It's stiff enough for the sprinter and light enough for the climber. It would be a moot point but "laterally stiff and vertically compliant". To put it in more hyperbolic terms: I've raced bikes on the velodrome that I would consider "noodles" compared to this bike. I've raced at a very high level for a long time and I would be extremely excited to have this as a team issue bike.

Fantastic "Halo" bike buster.

What's the difference between the 2013 and...

What's the difference between the 2013 and 2014 frames?

The only real difference is that Ridley decided to go with a BB30 bottom bracket for the 2014 SL frame rather than a PF30 bottom bracket on the 2013. Please let me know if I can help you out any further-

The 2014 Helium SL that i built up has a press fit 30 bottom bracket

What he said...

  • Familiarity: I've used it several times

Interestingly enough, Trevor helped me out with my Helium SL build. Definitely contact him if you're in the market for one! I'd have to echo most everything he stated in his review below. With full SRAM Red 22 and Reynolds Assault SLG's, this thing practically begs you to get out of the saddle and hammer away; especially when the road points upward. There's an immediacy to forward momentum that can only be achieved through the combination of lightweight and bottom bracket stiffness. It somehow holds speed very well for a "non-aero" frame too; average is up ~1 mph overall. My other bike (that I've been truly happy with up to until now) is a Cannondale Hi-Mod SRAM Red Synapse. While comfortable and fast enough on group rides, the Cannondale now feels almost lazy and sluggish when compared to the Helium SL. Another pleasant attribute of the Ridley is comfort. Put in a 75 mile day my second day with it, and it was easily as comfortable as the old Synapse. Now, the poor old Cannondale will likely end up on the sale block...

As always, be sure to confirm your measurements! I ended up sizing down on the Ridley to a small from a 54 on the Cannondale. Build ended up weighing in at 13.6 lbs minus water bottles and saddle bag.

What he said...

Thanks for the awesome review Scott! Hope you're still enjoying your Helium SL. That is a super rad build you put together!

f there's anyone looking for more information on this or any other Ridley bike, please give me a call. You can request me on chat, reach me by phone (1.888.276.7130 ext. 4579), or send me an email @ at any time.

Avg. ride time: 11h 34m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Stiff, Light, All-Arounder

  • Familiarity: I've used it several times

Helium SL: lighter than air, stiff and light.

Yep, that about describes it perfectly.

Our copy goes into great technical detail on how Ridley has made this frame so light and stiff, but with personal experience with it, I'll just stick to how it actually rides.

This rides like a race frame. Responsive, stiff when heavy power's applied, fast when any acceleration is needed, and nimble but stable when cornering at speed. Even with these characteristics, it it is still incredibly comfortable. Found it very easy on the body on rough roads or long treks in the saddle, and it has a geometry that is not overly aggressive nor perfectly matched for an endurance frame only. It's a frame you could take to your local crit races during the week, and ride for hours on end on the weekends.

I felt it was best suited for climbing with ease and descending with finesse, but also found it more than capable at speed on the flats. A very capable all-arounder in my book, a great bike to do it all.

If you have any questions, please feel free to get in touch with me directly at

Stiff, Light, All-Arounder

Ridley Helium SL

  • Familiarity: I've put it through the wringer

Three words: buy this frame. Light, stiff, and stable with beautiful workmanship. Can climb, descend, and sprint without any issues. It's a real, non-tricky race frame without all the crazy tube shapes or aero ostentation found on the latest models. Will build up easily to 13.5 pounds with standard group sets, 12.5 (ish) with sew-ups. But unlike some other superlights, it's not jittery or unstable. Ridley has had years to refine the Helium and they've done a great job with the SL. This is about the 20th race bike that I've owned and it's one of the best.