A NEW WAY TO TAME THE WIND
Wilier's approach to aerodynamic design consists of seeing wind and airﬂow as allies. Wilier's Twinfoil respects the nature of airﬂow and seeks to manage it at every opportunity in order to maximize efﬁciency by diminishing air turbulence and resistance. Chainstays, seatstays and fork legs have a wider proﬁle in order to distance them from turbulent air generated by spinning wheels. Wilier's Aerobrake design likewise widens the structural proﬁle of calipers to remove them from the path of rotational air turbulence. The rear Aerobrake is positioned below chainstays and housed within a carbon shell to hide it entirely from the ﬂow of air. The rear dropout system enables precise positioning of the rear wheel via four adjustment bolts to establish ideal wheelbase and alignment of cogset in relation to the rear derailleur, including during wheel changes. The Twinfoil also boasts an integrated seatpost binder assembly housed within the top tube. This expansion assembly securely anchors the airfoil seatpost within the aero seat tube while preserving seamless aerodynamics. Internal routing also minimizes exposure of brake and cable housing. Wilier's orbital front derailleur adjustment bolt ensures proper positioning of the front derailleur. These features facilitate optimal orientation in relation to chainrings across all prominent drivetrain systems for easier setup and optimal shifting performance. The most visually dramatic aspect of the Twinfoil is its front end, which features another Wilier Triestina exclusive destined to change the way aero bikes are designed: the Twin Fork. This component of the Twinfoil provides a new level of stability in the front end, as well as setting the standard in airﬂow management. The fork legs act as ﬂow stabilizers to minimize turbulence, while their integration with handlebars diminishes structural deformation and ﬂex.
Wilier's proprietary Twin Fork was born of research and wind tunnel testing which have taught us that aerodynamic design is about much more than a bike’s frontal area. It’s really all about airﬂow management: developing a frame and fork capable of directing airﬂow through and around body parts as well as components and wheels.The most advanced aerodynamics and ﬂuid dynamics studies have led us to measure turbulence in terms of resistance. That is why we chose to name the two airfoil elements that comprise the fork as “ﬂow stabilizers”, each of which boasts an aerodynamic proﬁle that diminishes air turbulence and directs passing airﬂow in an efﬁciently linear trajectory. Imagine a diver entering the water while attempting to generate as small a ripple effect or splash as possible. We’ve applied the same concept to frame and fork design, as well as to the combined bike-rider aerodynamic footprint. As a time trialist or triathlete penetrates the wind, the goal is to create as little turbulence as possible.
Another beneﬁt of Wilier's Twin Fork is the superior responsiveness and lateral stability it lends to the front end of the bike. By integrating handlebar and fork we can diminish the structural deformation and ﬂex inherent in other, more conventional designs. Since a race against the clock or bike split can come down to the millisecond, every watt of power generated by an athlete must be efﬁciently transferred to the bike, especially when the rider stands on the pedals at the start, out of a corner, or on a climb. The Wilier Triestina Twin Fork represents the most advanced combination of stability and aerodynamics, with extremely low drag and low energy dissipation coefﬁcients.
Wilier designed the Twinfoil brakes to be invisible to the wind. The front caliper adopts the proﬁle of the fork itself, being assimilated into its aerodynamic footprint. The rear brake likewise assumes the aerodynamic lines of the frame, positioned below the chainstays at the bottom bracket. It is housed in a carbon cover which encases the caliper and cables, hiding the complete assembly from the wind. Both calipers are of the “V-brake” variety for smooth, powerful and modular braking.
In contrast to horizontal dropouts implemented in the design of many time trial and triathlon bikes, like those utilized for track bikes to ﬁne-tune chain tension as well as tire distance from the seat tube, the Twinfoil boasts vertical dropouts. In working with ProTeam Lampre-ISD, we made the important decision to opt for vertical dropouts like those utilized on standard road bikes for ease of use, dependability and quick wheel changes. Wilier Triestina still insisted on a design that allowed for ﬁne-tuning of rear wheel position and therefore of the cogset’s orientation in relation to the rear derailleur. This enables optimal wheel alignment, aerodynamic positioning and smooth shifting. Thanks to Wilier's innovative solution providing 6mm of adjustability, wheel base and distance from tire to the rear of Wilier's truncated seat tube airfoil are customizable. This enables both aerodynamic and bike handling optimizations, as well as making wheel changes fast and simple.
In order to facilitate precise positioning of the front derailleur, we’ve designed an adjustment bolt accessible on the left side of the frame that enables orbital orientation. This means that not only can the front derailleur be adjusted to accommodate chainrings of various sizes; it can also be rotated and oriented around its own axis. By adding another element of adjustability, Wilier encourages the seamless use and integration of any type of crankset, chainring or rear derailleur, while promoting the smooth and precise functioning of these key components. This includes the use of oval chainrings.
INTERNAL SEAT BINDER ASSEMBLY
Wilier's unique and proprietary seatpost binder assembly is fully integrated and housed within the frame, hiding it completely from the wind for optimal aerodynamic.