Cervelo P3C

The most popular “high-end” Tri-bike for 3 years running….(frameset- $3300)
Victorious in roughly half of the Pro-Tour TT’s in which it has been entered and equally successful in Ironman Triathlons, the P3 Carbon is the reference for the time trial bike market.
Aero head-tube - no bulky nose cone, but an extremely thin, aerodynamically optimized shape
CCS - Constant Cross-section Seat-tube - The airflow over the seat-tube is predominantly horizontal. The new seat-tube shape has a cross section shape that is separately optimized everywhere between bottom bracket and the seat-stay joint.
New Cervélo aero carbon IAA seat-post - With its Integrated Accessory Attachment, this new seatpost can secure behind-the-seat components such as water bottle holders much more securely. Expect new products for the IAA system soon.
Integrated Seat-tube collar - By integrating the seat-tube collar completely into the top-tube, Cervelo is able to smoothen the aerodynamic profile even further. The airflow doesn't see the collar, yet the seat-post can be removed with ease.
ICS Internal Cable Stops - The best internal cable stop system available. Easy to install, easy to service, easy to keep clean and improved aerodynamics.
check the Cervelo site for geometry, specs, and prices

Cervelo P2C

Cervelo’s 2-tier carbon tri-bike. ($3k)
Constant width seat-tube cutout – The cutout has a constant width, closely covering the rear-wheel tire. Most cutouts (with the exception of the P3) have a cutout width that varies as you move up and down the cutout, thereby hampering the proper airflow from the seat-tube to the rear-wheel.
Aero head-tube - no bulky nose cone, but an extremely thin, aerodynamically optimized shape
New Cervélo aero carbon IAA seat-post - With its Integrated Accessory Attachment, this new seat-post can secure behind-the-seat components such as water bottle holders much more securely. Expect new products for the IAA system soon.
Integrated Seat-tube collar - By integrating the seat-tube collar completely into the top-tube, we are able to smoothen the aerodynamic profile even further. The airflow doesn't even see the collar, yet the seat-post can be removed with ease.
check the Cervelo site for geometry, specs, and prices

Cervelo’s “bang-for-the-buck” tri-bike. Maybe the fastest tri-bike ever built for under $2k. (Complete from $1750.)
Full aero TT/Tri frame and seat-post - Building on ten years of experience, this member of the P2 family offers pro-level performance at an affordable price. The down-tube, seat-tube and seat-post all feature Cervélo's proprietary True Aero aerodynamic shapes.
Rear wheel cutout - The seat-tube features a tight-fitting rear wheel cutout to further improve the aerodynamics. The frame has horizontal dropouts with set-screws to allow the rider to adjust the cutout gap depending on the size of tire used, and ensures that the airflow from the seat-tube to the rear-wheel is as smooth as possible for tire sizes from 19-25mm.
Cervélo Smartwall 2 tubing - Putting the material where it matters, the P2 SL offers great bottom bracket and torsional stiffness despite the narrow aerodynamic profile of its tubes.
ICS Internal Cable Stops - The best internal cable stop system available. Easy to install, easy to service, easy to keep clean and improved aerodynamics.
Adjustable geometry - The flippable seat-post allows for an adjustment in seat-tube angle range of anywhere between 74-79 degrees so the rider can tailor the geometry to his/her specific desires
check the Cervelo site for geometry, specs, and prices