Bump up the speed.
Rear suspension isn't something you often think of when conceptualizing road bikes, but when your superstar team asks for something to help soften the cobbles of the spring classics and reduce rider fatigue, you get inventive. At the request of Team Sky, Pinarello brought in the same group of Jaguar supercar engineers who helped design the revered Dogma F8 to create the new 2016 Dogma K8-S Road Bike Frameset. Boasting venerable Pinarello heritage and an unprecedented lightweight rear suspension, this frameset sets the new standard for rough-road speed.
Sticking with its proven ally in composite development, Pinarello again relies on Japanese carbon fiber supplier Toray for the K8-S frame's material. It features Torayca T1100 1K Dream Carbon with Nano-alloy technology, which is the same material used in the Dogma F8. While the stuff's name is certainly impressive, its application is even more so. T1100 1K is the current go-to outer skin for many modern aircrafts, and its stiffness-to-weight ratio is nothing short of stunning. But weight, of course, is only a slice of the Dogma equation; we all know tube shaping also plays a vital role in the bike's handling and overall efficiency.
Starting at the front of the frame, Pinarello applies its Onda fork, with ever slightly more rake than the F8's front end to add a hint more compliance and stability to the ride. The Onda fork is derived from that of Pinarello's TT-specific Bolide, wearing an optimized surface profile that works with airflow from the front wheel. The blades describe a somewhat bowed or convex shape, which Jaguar's engineers say keeps air attached, reducing the size of the wake without creating too large a frontal zone.
Moving to the frame, the front triangle closely mirrors the shape and aerodynamic profile of the Dogma F8. Pinarello incorporates its signature FlatBack technology with its oval-front and flattened-back tubing throughout the frame and fork for an aerodynamic profile that slices cleanly through the wind without any extra materials bogging down the scale. An integrated seat clamp and FlatBack seatpost add to the wind-cutting advantage to get you wound up like a pouncing cheetah on your way to the finish line.
At the rear triangle, the K8-S utilizes a markedly different layout than the F8. Most noticeably, a small elastomer suspension system, dubbed the Dogma Suspension System 1.0, sits at the seatstay junction to provide up to 10mm of plush cushion to smooth out bumpy roads and cobbles without sapping away power. While Pinarello is understandably secretive about the final shape and mix of the elastomer, it claims that this system effectively dampens vibrations without any excessive movement when riders dump watts into the pedals. The chainstays and seatstays on the K8-S have also been flattened compared to the F8 to provide additional compliance over the bumps while maintaining lateral stiffness.
You'll undoubtedly notice the seamless integration of the fork with the tapered 1-1/8 to 1-1/2in streamlined head tube and oversized FlatBack down tube. At the bottom bracket junction, Pinarello stuck with its proven Italian-threaded BB, a design choice it stands by for both reliability and overall rigidity. Additionally, the extensive CFD testing revealed that lowering the seat tube water bottle mounts results in less drag. Because of this, Pinarello incorporated three holes on the seat tube and down tube for two bottle mounting positions.
Pinarello's asymmetric design philosophy is ever-present in the Dogma K8-S, as its engineers again restudied the forces in action as a rider stands on the pedals, pulls on the handlebars, and muscles the bike through corners. FEA (Finite Element Analysis) confirmed that the asymmetrical design was beneficial in leveling the variances in frame deflection from one side to the other, which is why the K8-S' tubes have been arranged in a similar layup to better balance drive-side forces.
As with the F8, carefully engineered internal cable routing on the new K8-S allows for you to easily choose between either mechanical or electronic shifting systems without any penalty to the bike's aesthetics or its aerodynamic profile. The K8-S features interchangeable cable stops at the frame openings that are capable of being intuitively swapped out should you select different drivetrains throughout the life of the frame.