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Ridley Dean RS 10 Ultegra Complete Road Bike - 2015

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Item # RID002I

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Item # RID002I

Aerodynamics don't always make sense.

In a perfect vacuum, creating the most efficient aerodynamic bicycle would be an easy job. Just make it light and stiff. But since we don't live and ride in a vacuum, questions of aerodynamics must be addressed, and the Ridley Dean RS 10 Complete Road Bike does so in ways that aren't always intuitive but do produce wind-tunnel proven results.

By now, you're no doubt aware of the benefits and properties of high-modulus carbon fiber, so it should come as no surprise that a manufacturer of Ridley's standing strategically arranges a blend of 40, 30, and 20 ton uni-directional carbon fiber moduli throughout the Dean RS in order to maximize comfort without sacrificing efficiency or weight. This is a fairly common practice, but what really sets the Dean RS apart from its competitors is Ridley's FAST-Concept design ethos. FAST-concept is a bike-wide application, extending to the Dean RS F-Splitfork, the aerodynamic teardrop tubes, and even the paint used on the frame.

The F-Splitfork is one of the Dean RS's head-scratchers. It actually creates more drag in the wind tunnel, but only while the wheels are standing still. When the wheels are rotating, the F-Splitfork nets a claimed 7.44% less drag than competing fork designs. It achieves this reduction in drag by redirecting the air resistance that spokes encounter at the top of the rotation, when they're moving forward into the wind. Think of the split in the fork as a kind of emergency release valve for the extra wind resistance that a wheel's rotation can create. The aerodynamics of the Dean RS also owe a great debt to the teardrop-shaped tubes. Like the varied moduli of carbon in the frame's layup, teardrop tubes are now a standard feature on aerodynamically-minded frames, so Ridley ups the aerodynamic ante with paint. Yep, that's not a typo and you did read right: paint.

According to Ridley, the F-Surface paint addresses the tendency of airflow to release prematurely from certain areas of the frame, which in turn creates additional drag in the form of low pressure areas or stalled air in the frame's wake. These low pressure areas result from the tendency for bodies in motion through a surrounding medium (in this case, bicycles through air) to create turbulence in the lamina, or layers, of air through which they're passing. It's helpful to think of the F-Surface paint as embracing and facilitating that turbulence. We'll forgo the details of laminar and turbulent drag by noting that, basically, the paint's texture keeps the air on the bike rather than letting it release into the low-pressure areas of stalled air that create drag. This results in a claimed drag differential of -4.03% at 50 kilometers/hour (read: a faster time between T1 and T2).

The Dean RS is laid-up in a triathlon-specific geometry that's more comfortable than the the line-topping aerodynamic frames, the Dean Fast. The Fast uses a more acute seat tube angle and a lower bottom bracket for a longer effective top tube and a much longer seat tube. This stretches the rider out lower and longer while tucked on the aero bars. There are obvious benefits and downsides to this, and the Dean RS offers a less aggressive geometry for cyclists who aren't as flexible or don't require such a significant drop between saddle and headset. Over the course of 56 miles, a little more comfort can be more important to your overall time than a slightly more aerodynamic body position.

Ridley equipped the Dean RS 10 with a strong mix of Shimano and Microshift components. The star of the group is the crankset, a place where manufacturers will often skimp while building bikes. The Dean RS 10 comes with Shimano's over-performing Ultegra crankset, which is kept company in the drivetrain by Ultegra derailleurs and a 105 cassette. Microshift's TT 11s shifters throw the derailleurs, and Ultegra brake levers control 4ZA TT brakes. The peripherals are also well-spec'd, from the Deda Elementi stem and handlebars to the Fulcrum Racing Quattro wheelset and Continental Grand Prix tires. The dropouts are reinforced with stainless steel.

The Ridley Dean RS 10 Complete Road Bike is available in five sizes ranging from X-Small to X-Large in the color White/red.

Tech Specs

Frame Material:
40, 30, 20-ton carbon fiber
Fork Material:
40, 30, 20-ton carbon fiber
straight 1 1/8 mm
MicroShift bar-end 11-speed
Front Derailleur:
Shimano Ultegra 11-spd
Rear Derailleur:
Shimano Ultegra 11-spd
Shimano Ultegra 11-spd 52 / 36 t
Bottom Bracket:
68mm English
Shimano 105 11-spd 11 - 28
Deda Elementi ChronoNero TT
Deda Elementi
4ZA Carbon Aero TT
Fulcrum Racing Quattro H35
Continental Grand Prix
Tire Size:
700 c x 23 mm
not included
internal cable routing
Claimed Weight:
[medium] 1400 g
Recommended Use:
Manufacturer Warranty:
5 years on frame

sizing chart

Dean 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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Unanswered Question

Is this bike UCI legal?