Cervelo P3 58cm Alloy Frame NOS Triathlon Time Trial
Cervelo P3 Frameset 2004
Comes with Frame / Fork / Headset
NOS The frame has had wheels and a stem bolted on for display purposes
Also a few little marks from shop soiling.
1" steer tube
Speed & comfort are the two key goals for the P3. Every detail on this frame is geared towards aerodynamics, from the curved seattube cutout which exactly matches the width of the rear tire to the TrueAero shapes of its downtube, seattube, seatstays and seatpost. At the same time the frame provides excellent bottom bracket stiffness (the highest of any TT/tri frame tested by TOUR, Europe's largest bike magazine) as well as good comfort for the longer races.
Curved and recessed seattube cutout
Rear wheel adjuster screws for optimal tire clearance
650c/700c wheel size optimized per frame size
Adjustable geometry with 74-79 degree seattube angle range
More aero due to optimized rear wheel cutout
Stiffer bottom bracket for even better power transfer
To optimize aerodynamics, the tubes need to have a very specific shape, a profile determined by the National Advisory Committee on Aeronautics (NACA). This shape can only be obtained by extruding the tubes, as forming round tubes imposes too many shape limitations. As an example, a round tube has about 5 times the drag of a NACA-profile, while a crushed tube is about 3 times as bad. A very important part of the shape is its thickness-to-chord ratio. If this ratio is high (meaning the tube is relatively wide compared to its depth), the air flow will detach, creating turbulence and high drag.
It is also important to note that the correct NACA profile is not round at the front but eliptical. Aerotubes with a round front and sharp trailing edge are becoming more and more popular (because it they are easy to make out of a round tube, and because they will easily take a round seatpost if used as a seattube). But unfortunately they offer hardly any aero benefit, as the bluntness of the round front already deflects the airflow before it reaches the trailing edge.
The P3 has a revolutionary curved rearwheel cut-out, which is designed to better shield the rear wheel from the airflow. The seattube consists of a cross section that mimics the front half of an airfoil. Together with the tire and rim of the rear wheel (or even better, a rear disk wheel), this tube forms one intergrated section that guides the airflow past the rear wheel most efficiently.
In contrast to other frames with a rearwheel cut-out, this cut-out has a constant width, just like the rear wheel has. Cervélo was able to achieve this by producing this tube specifically for this purpose, as opposed to using a standard aerotube and then making a cut-out into it. The picture above shows how the horizontal cross section (which is the way the air flows) of the P3 cut-out is always optimal, whereas the cross-section of a normal cut-out is less than perfect at most levels.
A steep seat angle (around 78 degrees) in combination with aerobars works well for most people, as it enables a more aerodynamic back position without compressing the hip angle. Triathletes especially benefit from this, as it will improve their running coming off the bike. Most time trialists (although there are many exceptions) prefer a more relaxed seat angle (74-76 degrees). But the bottom line is that one has to try both options to find out what works best. This is why both the P2K and the P3 come with a custom aero seatpost that can be adjusted to suit seat positions of 74-79 degrees with a simple flip of the head. Now riders have the flexibility to experiment with their position without risking that their bike will not be able to accommodate them. The first table will show the dimensions of our frames with the seatpost positioned for an effective seattube angle of 78o, the second table shows the dimensions with the seatpost at a 75o effective seattube angle
- Date Listed:18/03/2019
- Last Edited:29/06/2019
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