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Item # RID0038

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Item # RID0038

Description

Ridley spent a small fortune in the wind tunnel to develop a bike that shaves away drag by doing more than incrementally narrowing tube profiles or shortening a head tube. Rather than abiding by standard industry practice, i.e. knock off a Cervélo P3 and spice it up with fancy paint, they've gone to the heart of structural engineering and found answers to questions other companies never thought to ask. Ridley calls their Dean time trial frameset "The fastest bike in the world", and it's more than just braggadocio.

Initially, the Dean started out as a collaborative effort between Ridley and Oval Concepts, as the Belgian bike maker was keen to use Oval's Jetstream technology, but eventually it made sense for Ridley to buy the rights to Jetstream. Once that happened, Ridley aggressively invested in its further development, resulting in the R-Flow design you'll find in the Dean's fork legs and seat stays.

As we all know by now, drag increases exponentially with airspeed, which means even small changes to reduce your drag will have a disproportionately positive impact at higher and higher speeds. Though every inch of the Dean is sculpted to cheat the wind, R-Flow technology focuses on one specific issue of bicycle aerodynamics -- according to Ridley, your wheels produce 8x more drag where they pass through your fork and seatstays due to the turbulence of the colliding air masses there. The R-Flow fork and stays on the Dean minimize this drag thanks to their long slotted airfoils that direct oncoming air away from the turbulent areas near the wheels.

The slotted design of the Dean's airfoils addresses the fact that at cycling speeds, a single airfoil can't deflect a large mass of air without creating substantial drag. Not unlike racing catamarans or aircraft landing flaps, slotted airfoils can deflect air without creating drag. The Dean redirects the air stream away from the wheels, and has the added benefit of creating a low-pressure area that further reduces the drag of your rims and spokes.

The story of the Dean goes beyond R-Flow. Ridley used oil mapping in the wind tunnel to isolate spots of turbulent airflow on Dean prototypes. Not only did this technique allow Ridley to re-sculpt the Dean throughout its development, but it had the ultimate benefit of helping them identify key sections of the frameset where they couldn't re-sculpt the frame due to structural limitations. In these seemingly unfixable black holes of drag, they apply a textured surface treatment for boundary layer control. Ridley calls it "R-Surface paint", and our affectionate shorthand here is "aero paint". These thin stripes of texture are amazing. They purposely trigger a known amount of turbulence that re-energizes lost boundary layers, ultimately re-establishing laminar flow and minimizing drag. In other words, they carefully create an airflow mess in order to make an unprecedented cleanliness. Airflow control is why you see vortex generators on jets, and why you see dimples on golf balls. And it's exactly what Ridley does with their R-Surface paint.

One of our favorite details of the Dean is a topic normally swept under the rug when you talk about TT bikes: weight. The cost of being aero, you'll normally hear, is added weight. Thankfully, with the Dean you can ride a TT bike that feels as light as a road bike. A size Medium frame weighs 1360g before you cut down the integrated seat mast to height. You'll be equally fast on any course, dead flat or relentlessly rolling.

The Ridley Dean is Black/White and comes in four sizes from X-Small to Large. We strongly suggest that you focus on the virtual top tube length as you make a determination of the proper size. The Dean requires an English bottom bracket, and a braze-on front derailleur. Your frame will come with an integrated headset and a seat clamp assembly that allows you to position your saddle in an effective 73.8, 75, or 76° position. If you'd like to ride it in the 78° position, a different clamp is available (you'll need to purchase it separately) that allows this angle. The standard clamp assembly allows an 18mm range in saddle height and comes with 1mm micro-spacers for small adjustments. (Ridley offers an additional aftermarket clamp that provides 40mm of height adjustment.) One other nice bonus of the Dean is that the frameset includes with a set of Oval Concepts' A700 aero brake calipers.

Please provide us with your BB-Saddle Rail height in the "Comments" section of our order form so we can properly cut down the seat tube for delivery.

One final note on sizing: On all sizes, the top of the uncut seatmast is 235mm above the center of the top tube.

sizing chart

Bike size by rider height

|

Geometry chart

Fuji Bicycles

 

Geometry Chart

 

Altamira LTD
 

Seat Tube

(c-t)

Effective Top Tube

(eTT)

Stack

(S)

Reach

(R)

Standover

(SO)

Head Tube

(HT)

Head Tube Angle

(HTo)

Seat Tube Angle

(STo)

Bottom Bracket Drop

(BBD)

Chainstay Length

(CS)

Wheelbase

44 44.0cm 51.5cm

51.7cm

36.3cm 72.1cm

12.0cm

72.0 deg 75.0 deg 6.9cm 40.5cm 97.1cm
47 47.0cm 53.0cm

52.8cm

37.0cm 74.1cm 13.0cm 72.5 deg 74.5 deg 6.9cm 40.5cm 97.7cm
50 50.0cm 54.5cm 54.0cm 37.0cm 76.0cm 14.0cm 73.0 deg 73.5 deg 6.9cm 40.5cm 97.6cm
53 53.0cm 56.0cm 56.0cm 37.9cm 78.3cm 16.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 98.6cm
55 55.0cm 57.5cm 58.0cm 38.9cm 80.1cm 18.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 100.1cm
58 58.0cm 59.0cm 60.1cm 39.7cm 82.1cm 20.0cm 74.0 deg 73.5 deg 6.9cm 40.5cm

101.0cm

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