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Item # RID0032

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Item # RID0032


The Ridley Dean RS and its predecessor, the Dean, are remarkably similar bikes. However, there are more differences than the use of a regular seat post on the Dean RS. The entire frameset has been built around the idea of making a better triathlon/TT bike.

Ridley makes no secret about the Dean. It's a time trial rig designed for ProTour racers. This may seem like a good thing for you, as they spared no expense in terms of making the bike ultra fast. If there was a change they could make to reduce drag, they made it. It's not just the split fork blades, the split seat stays, the aero edge paint, the reversed front brake, the slicing head tube, the tucked-under rear wheel, aero seat mast, but the position. The Dean may only be comfortably rideable if you've tuned your aero position with the help of a pro and have years and thousands and thousands of miles in the saddle. Not only would you need to be fit, but extremely flexible.

All the aero advances of the Dean are great on their own, but if you can't get low enough, you won't be fast because your back will be in such heart-breaking agony that you'll have no desire to pedal hard. This is where the Dean RS comes in; all those aero advances tweaked to work in a frame built for everyone else.

Not only does the Dean RS have a regular seat post instead of an integrated seat mast, which makes it great for travel, but everywhere you look, the frameset has been tweaked to make it a better rig for most cyclists. Notice the head tube. It's taller than the headRidley Dean RS Detail tube on the same-sized Dean. Likewise, the top tube is shorter. Admitting to a higher position might not seem Pro, but then again, few of us are professional cyclists. Continuing the changes; the rear wheel isn't faired as closely behind the seat tube as on the Dean, but the tight fit on the Dean is possible because it has rear-facing horizontal dropouts, which can be a little finicky to work with. On the other hand, the Dean RS has traditional vertical dropouts for convenient and quick maintenance.

The two Deans also share the same 4ZA R-Flow full-carbon monocoque fork. The jet foils, aka the split in the legs, reduces drag by 6.4% as it draws turbulent air away from the spokes, which, no matter how aero, will add turbulence when mixed with wind. The Dean RS also shares the R-Surface paint treatment which smoothes out the air flow around the head and seat tubes. This reduces drag by another 3.6%. And like the Dean, it has a rearward facing front brake, which is included with the bike.

The included aero seat post has three clamp positions. If you go with the rear position, the seat angle is 77-degrees, middle, it's 78-degrees, forward is 79-degrees.

The Dean RS frame itself is shaped differently than the Dean because it uses 30- and 24-ton high-modulus carbon-fiber, rather than the 50-, 40-, and 30-ton found in the Dean. Since the material isn't quite as light, they made the tubes smaller to minimize any weight gain. They also kept the aspect ratios the same to keep the frame as aerodynamically slippery as possible. One benefit from the changed shape is that the Dean RS frame is actually lighter than the Dean, with a claimed weight of 1250g for a medium.

The Ridley Dean RS is Red/white/black and comes in five sizes from X-Small to X-Large. It uses a braze-on style front derailleur, and the max chain ring size is 55 teeth. The dropouts are carbon-fiber, and the rear derailleur hanger is replaceable.

sizing chart

Bike size by rider height


Geometry chart


Geometry Chart


Dean RS

Seat Tube


Effective Top Tube






Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop




XS 46.3cm 50.0cm 48.0cm 40.4cm 8.5cm 72.5o 78.0o 6.0cm 39.0cm
S 49.5cm 52.2cm 51.2cm 41.8cm 11.0cm 73.0o 78.0o 6.5cm 39.0cm
M 55.6cm 54.5cm 53.0cm 43 .0cm 13.0cm 73.0o 78.0o 6.5cm 39.0cm
L 57.5cm 56.0cm 55.0cm 44.0cm 15.0cm 73.0o 78.0o 6.5cm 39.0cm
XL 60.0cm 57.5cm 57.7cm 45.0cm 18.0cm 73.0o 78.0o 6.5cm 39.0cm

Ridley Dean RS Geometry Chart

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Avg. ride time: 8h 42m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

98% awesome

  • Familiarity: I've put it through the wringer

Everything posted below is spot on as far as quality - with exception to the janky seatpost bolt. My remedy for this was to replace it with one that uses an Allan wrench. You still need a split saddle to be able to adjust it properly, or if you stick with the original bolt, a crescent wrench.

Otherwise stiff and corners like a dream. With it's relaxed TT geometry I am thinking of converting this to a road frame.

98% awesome

Seat Post Clamp Details?

  • Familiarity: I've used it once or twice and have initial impressions

How does the multi-position seat clamp work? I cannot see details in the stock photo. Trying to understand how the positioning works...are there 3 physically distinct clamps?

There is one bolt that attaches the saddle. That bolt secures the saddle clamp to the seat post. There are three holes in the top of the seat post that accept the saddle clamp bolt.

Seat post clamp is the one major fail on this bike, which is otherwise completely rad. If you have a split saddle then you can adjust the BOLT from the top. I replaced mine with one from the hardware store that uses an Allan key instead.

Great Frame! Unreal Price

  • Familiarity: I've used it several times

Was looking to get back into triathlon after a 5 year hiatus and bought this frame set to go with my Sram Force 1groupo. Was concerned about the size since I am 6ft tall with long legs and short torso. After using their fit chart the medium seemed to be sized right and Ridley's run a little big. I did have to use 35mm of spacers but my back is not what it used to be! The ride is solid and I like the 3 position seat post. It really allows you to get that perfect fit. Paint and finish were very nice also. I replaced the rear tektro brake with my Cain Creek titanium single pivot to save some weight. The front tektro brake works well and I like how its tucked behind the fork. I weigh 198 and this frame is very solid and responsive. May be too stiff for some but for a bigger rider its a plus. Cable routing is very clean and I like how the top tube encloses the rear brake cable. For the money I am not sure you can beat this whether you are a top racer or beginner triathlete. The geometry on this frame would also make a good road bike as the head tube angle is pretty tame.

Just a heads up, I believe the cane creek and the stock rear brake weigh close to the same, if not the stock rear brake may be lighter at 120 grams (though the cane creek ti certainly looks slimmer). I'd use the stock rear brake because although they are both single pivot, the stock brake uses a cam which gives it quite a bit more power. You may not need that much grab from your rear brake, but if the weight is a wash, it can't hurt.

Great frame, great deal

So I built this Ridley Dean RS for my triathlete wife. I also do a lot of photography so I snapped it before it hit the road. This is her first TT bike so it's not setup totally aggressively yet.

Great frame, great deal


what spacers did you use on the steerer, 3.5 bottom 0.5 top?

Unanswered Question

I got the frame, but i cant find any info...

I got the frame, but i cant find any info on the maximum spacer height on the steerer.

Do you have that information?

is the frame compatible with SRAM Apex...

is the frame compatible with SRAM Apex Brakes?

all indication is that they should work.

Avg. ride time: 13h 1m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Will the Magura RT8 TT brakes work on this...

Will the Magura RT8 TT brakes work on this frame?

The rear RT8 brake would mount without issue, the problem would be the clearance on the front brake on the backside of the fork. That clearance issue the the reason Ridley stock calipers withe the RS frame.

What is the steerer tube diameter?

What is the steerer tube diameter?

Best Answer

The Dean RS has a 1 1/8" straight steerer tube.

Some greats things, some not so good.

  • Familiarity: I've used it once or twice and have initial impressions

So I've built the bike and ridden it a little.

For the most part, the internal routing is easy to run, and the build was easy. The rear brake cable housing goes all the way through the top tube which is actually kind of dumb as the rear brake is a single pivot, meaning that length of the housing is important but because of the routing you can't control it that well.

The included brakes work well. the front is fairly proprietary, the rear is a single pivot that works very well but is dependent upon good installation. The front brake when installed is very obtrusive on the back of the otherwise very awesome looking svelte fork.

The frame and fork are a bit beefier than the bikes you see from trek and cervelo, with tubes around 34ish millimeters wide. The headtube on this bike looks pretty aero. The finishing on the bike is nice but not perfect. The Seatpost has a great textured area to prevent slipping. Weight of the frame was 1390, fork around 550, seatpost was 230.

My size small only had bottle mounts on the downtube, would have preferred seattube if there is only going to be one set of mounts.

The seat angle is fairly steep and the included seatpost offers some adjustment but not a ton, something like 2-3cm plus rail length.

The riding I've done on it has been good. Like most modern bikes, its stout and feels solid. The geometry on the front end is a little more "road bike like" than some other manufacturers with the 73 degree headtube angle but it's got enough wheelbase to keep things stable. Ridley advertises it as a "relaxed" bike but if you compare the stack and reach its really a middle of the road. I've got 13cm of drop, saddle to pads.

This is a good bike, especially for the price. The frame, fork and post are really nice but the brakes and cable routing make it look a little sloppy but are still functional.

Excellent value!

  • Familiarity: I've used it once or twice and have initial impressions

To get this frame at this price is the deal of the century. I just received it and built it up with components I had (my garage looks a bit like a used bike shop - sound familiar?). But the frame is full carbon with internal cabling, carbon fork, absolutely beautiful graphics and paint quality. If you're at all interested in a triathlon / TT bike, just get it. And btw, yes it's from a couple years ago but the newer years' designs are not as nice, in my view.

Is this frame Di2 compatible?

Is this frame Di2 compatible?

Best Answer

DI2 will work, but it needs to e run Externally. Definitely not as clean

What comes with the frame is the headset...

What comes with the frame
is the headset include, and what about the brakes are includes too?

Best Answer

Fork, Brakes, headset, seapost, seatclamp are all included.