SEATPOST & RIDE QUALITY
We pioneered a unique seatpost design for the previous-generation AR, and it offered such a high level of aerodynamic efficiency and a superb ride quality that we used it as a basis for our latest World Championship-winning triathlon bike. For our new AR, our engineering team fine-tuned the post's shape as part of the complete airfoil project. In addition to a more aero profile the post still features the signature split design that serves three unique functions.
One, it allows for an aerodynamically optimized interface between the post and the frame’s seat tube junction; this means no extraneous clamps. Two, it allows the two halves of the post to flex and shear independently of one another, which increases overall rider comfort by mitigating the effects of high-frequency chatter and low-frequency big hits from making their way from the road to the rider. To ensure optimal ride quality, we created a co-molded insert that lives within the junction of the seatpost and seat tube, giving the entire interface added compliance and a super tuned ride. Third, the slotted seatpost design allows for the use of a proprietary clamping mechanism that is designed specifically around the unique properties of carbon fiber and intended to ensure maximum reliability. Rather than using a commonplace band clamp-style mechanism that would compress the leading and/or trailing edge(s) of the aero-shaped post, the AR’s system clamps each wall of the post against each inner wall of the seat tube. This not only ensures that the seat tube and seatpost will not be damaged due to unnecessary compression, it also results in a lighter overall setup thanks to the use of thinner carbon walls, as well as a more finely tuned level of compliance for rider comfort.
The new AR’s seatpost provides 112% more flex than the version on the previous-generation AR. Purists will say that an aero race bike shouldn’t be “comfortable.” But we disagree. A modest increase in compliance at the point where the rider rests the majority of his or her body weight makes for a more comfortable ride quality—this means that you can ride harder for longer, and that you’ll be less fatigued when you start your sprint to the finish line.