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Item # RID0083 40% Off

5 5

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The science of speed.

Ridley has taken the liberty to not only designate its frames by their intended purposes, but to actually design in accordance to the singular characteristics of aerodynamics, stiffness-to-weight, and strength. And, as might already know, the Noah is Ridley's singular aerodynamic offering. At the top of the mountain, you'll find the Noah Fast, where Ridley has applied all of its knowledge and technology. Meanwhile, the Noah RS, found here, takes much of the Noah Fast's FAST-concept wizardry, and dithers it down to a more affordable package.

Ridley's FAST-concept was developed for one purpose -- free speed. At its pinnacle, this concept employs Ridley's F-Splitfork, F-Surface paint, F-Brake, and an integrated seatmast. And here, on the Noah RS, we see all of that technology, sans the F-Brake and seatmast. Instead, the Noah RS uses a more conventional seat post. However, the included seatpost is still produced from aerodynamically-shaped carbon fiber. Additionally, this adds a greater versatility to your position on the bike, and makes traveling quite a bit easier. In terms of the RS' use of conventional brake calipers, we find it prudent to weigh out the advantage of simple service and maintenance over the F-Brake's claimed 4.3% drag reduction.

The carbon-fiber lay-up has likewise been tweaked to bring the price downward and to also make the RS a touch more compliant. Accordingly, the RS uses a blend of 40-, 30-, and 24-ton high modulus carbon fiber. The 'ton' designation means that the carbon fiber is capable of withstanding x tons of pressure per square millimeter before achieving structural compromise. So, the main idea to take away from this is that the higher the tonnage, the stronger the carbon fiber. And, the stronger the carbon fiber, the less that needs to be used. That's why the Noah Fast's carbon range of 50- to 30-ton carbon results in an overall lighter frame.

The other big difference from the Noah Fast is that the RS seat stays are aero-shaped, but lack the split stay R-Flow design you'd find on the Noah. But, Ridley retained this technology on the front of the bike where aerodynamics are crucial. In fact, Ridley claims that the R-Flow jet foils in the 4ZA Sphinx full-carbon fork reduce drag over the frame by 6.4%. It's a full carbon fork with a carbon steerer and turns on upper- and lower-integrated 1-1/8-inch FSA bearings. For further aerodynamic savings, the RS also features the Fast's R-Surface paint technology. These are 'textured' applications of paint that have been strategically applied throughout the RS. Essentially, this small feature increases the laminar airflow over the frame, reducing drag by around 3.6%. Additionally, the RS' cables have been run internally to further maximize its aerodynamic advantage.

The Ridley Noah RS is available in the color Matte Black/red/white and in six sizes from XX-Small to X-Large. It uses a braze-on front derailleur mount because Ridley didn't want to constrain its aerodynamic design with a round seat tube for a derailleur clamp. It uses and English threaded bottom bracket, and the derailleur hanger is replaceable for greater durability.

Tech Specs

Frame Material:
40T high-modulus carbon fiber , 30T high-modulus carbon fiber , 24T high-modulus carbon fiber
4ZA F-Splitfork
Fork Material:
carbon fiber
Fork Blade Shape:
Steer Tube Type:
carbon fiber
Rear Axle:
130 mm
Dropout Type:
Replaceable Rear Derailleur Hanger:
Head Tube Diameter:
Headset Included:
yes, FSA integrated
Bottom Bracket Type:
68 mm English
Front Derailleur Mount:
Derailleur Pull:
Seat Collar:
4ZA Aero
Seatpost Diameter:
Cable Routing:
Compatible Components:
Shimano, SRAM, Campagnolo
Ridley Aero seatpost
Recommended Use:
road cycling
Manufacturer Warranty:
5 years

Geometry chart





Noah Bike Geometry
Seat tube (center-to-center) 17.3in
Seat tube (center-top) 26.8in
Actual Top Tube 20.1in
Effective Top Tube 20.7in
Head Tube 5.1in
Seat Tube Angle 74deg 73.5deg 73deg 72.5deg 72.5deg
Head Tube Angle 72deg 73deg 73.5deg 73.5deg 74deg
Chainstay 15.9in
BB Drop 2.6in
Wheelbase 38.3in
Standover 29.1in

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Here's what others have to say...

5 5

A comfort bike, it ain't....

  • Familiarity: I've put it through the wringer

Built up pretty nicely. Not as light as my old Helium, but DEFINITELY has more aero properties. Crazy tube shapes, tucked in rear wheel, and internal cable routing. Speaking of internal routing, I understand it, but what a pain in the ass. The rear brake is full housing, through the top tube, and it was pretty easy, which lulled me into a false sense of security.
The gear cables were the old 'push-pull-until-you-find-the-hole' exercise. It was cool though, as I had a lot of practice with this through high school and college...wink, wink!
It's a race bike. It's not a "comfort" road bike, a la the Roubaix, or Domane, or even the old Helium.
It's comfortable, and smooth, as long as the road is the same. On rough, pot-holed, choppy pavement, the ride is not what one would call compliant. And I'm running 25c Vittorias @ 100-ish PSI.
It's tolerable for a rider that weighs more than 170 pounds, or doesn't mind the harshness. Fortunately, I'm both.
If you want a comfy, plush, cushy ride, look elsewhere.
That being said, yesterday was the first time I put an anger to the pedals, and I can assure you, it JUMPS forward when given the whip. No wasted motion or energy, AT ALL!

Turn in is quick, yet very predictable, like all Ridley frames. No drama in a hard turn. Lean it in, and the Noah rails through.
Outputs occur quickly. There's little need for big efforts to make it change line. Small inputs are all that is needed to get around holes in the road, or drop it into a corner.
It's not twitchy...no way. I rode it no-handed without issue. Let's say...it's direct.
It's a hard-edged sports car in a World filled with Camrys.
The aero thing is truly odd too. At lower speeds, it rides like a normal, really stiff bike. Once the speeds climb into the mid-high 20s, I liken it to a speedboat getting up on plane. It smoothes out, and feels like it wants to go forward. Ridley says it's fast, and it is!

A comfort bike, it ain't....
Responded on

Good review, nice set up. How do you like those wheels? their prices seem to be good alternative to other pricey carbon wheels.

Responded on

Hey Lam...
I really like the Williams carbon wheels. Can't really beat them for the money. These are the older 50mm deep wheels. Unfortunately, Williams doesn't make them any longer. The front is built on a White Industries hub after a racing 'incident', but the rear hub is just as smooth as it was on day one...maybe smoother.
They're stiff, and not terribly heavy. I think mine are right at 1550g for the pair.
Depending on your size, the fast set up for the road would be a 38mm front and a 58mm rear. Williams will mix and match like that.
Their customer service is outstanding as well.
I've ridden wheels from HED, Reynolds, Zipp, Bontrager, ROL, and Williams. I still have the ROL wheels and the Williams wheels.

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