Ultra SL - Pro
Shimano Ultegra Di2
- Ultra SL Carbon Monocoque Frame
- Shimano Ultegra Di2 2x12-Speed
- Ribble RI-2 Integrated Carbon Handlebars
- Mavic Cosmic S 42 Carbon Wheels
The Ultra SL is the result of our extensive R&D, paying particular attention to how the airflow interacts between the bike and rider. Taking an innovative approach to design and integration we've created a bike that hits the pinnacle of aerodynamic performance at real-world speeds and in everyday riding conditions. Through vigorous testing of the holistic package of bike and rider, we've ensured that a true performance gain is realised with the Ultra SL proving to be consistently faster than the benchmark Endurance SL R. Already aero-optimised and super light in design, the Endurance SL R has competed at World Tour level and been ridden to many victories by the Ribble Weldtite Pro Cycling and DROPS racing teams. The Ultra SL isn't just a bike for pro racers, it’s a superfast aero bike for everyone who is looking for significant performance gains in their pursuit of speed.
With watt-saving gains being achieved across all areas of the frameset, the Ultra SL has been optimised to perform in real-world conditions. Specifically around 5-10° of YAW to simulate the crosswinds most commonly experienced by a cyclist. Every aspect of this drag-defying aero bike is engineered to slice through the air with incredible efficiency and precision.
*Enthusiast rider = based on test speed of 22mph. * * Pro rider = based on test speed of 29mph. Time savings calculated from Drag savings in real world and wind tunnel comparison testing. See p.19/20 in R&D Paper for results.
Benchmarked against the optimised and race-proven Endurance SL R, tested with bike and rider, from CFD to wind tunnel and the real world. Resulting in a bike with significant performance gains, delivering an average 69.2 seconds advantage over 40kms across a full YAW sweep, up to 20°.
Visit our dedicated page to find out more about our research and development process
Every element of the frame, fork and seat post has been dissected, analysed, profiled, and tested in the pursuit of ultimate aerodynamic performance. To minimise drag, the forks form a holistic package with the headtube and handlebars to maximise airflow across a complete range of YAW, with fork blades of 68mmx15mm proving to be the optimal sweet spot for performance, providing significant aero gains at 5° and beyond. The profile of the fork and the position of the blade in relation to the rider and other downstream elements of the bike optimises airflow across the entirety of the bike. This interaction proved so harmoniously efficient that from 10° of YAW, the tube profile, in fact, starts to generate thrust, helping to propel you rather than push you back.
Aerodynamically optimised tube shapes ensure that the transition between the headtube, fork, and lower downtube performs from both an aerodynamic and handling perspective in the full range of YAW conditions typically encountered by a cyclist. The lower section of the downtube has been optimised to be faster with a bottle than without, demonstrating an advantage in generating thrust from 10° including the bottle. A crucial transition with the bottom bracket provides the torsional stiffness required for optimal power transfer which results in tangible performance gains.
The optimised and truncated seat tube profile conforms to the curvature of the rear wheel to shield the leading edge from the wind and significantly enhance aerodynamic performance by reducing turbulence.
The hallmark of any aero bike is its clean aesthetics and streamlined form. Integration of the brake mounts moves the brakes inboard of the fork profile to enhance airflow over the front end and minimise the effects of drag.
The Ribble RI-2 carbon integrated handlebar is a proprietary system that conceals every cable while providing optimal fit, adjustability, and seamless integration. This one-piece cockpit exemplifies the perfect marriage of form and function, combining a clean, cable-free aesthetic with advanced aerodynamics to reduce drag by up to 40% compared to a conventional handlebar setup. With a super-stiff carbon monocoque construction and refined ergonomics, the RI-2 system is designed for speed-conscious road riders who prioritise performance and all-day comfort.
The rear seat stay profiles are aerodynamically perfected to provide the ideal drag-defying ratio of width to depth which significantly enhances airflow over the rear end. Positioning the stays in perfect alignment with the forks maintains optimal flow attachment and reduces drag downstream of the rider for superior aerodynamics and lateral stiffness.
To help you select the correct size, please find your height below. The graphic below illustrates our recommendations, ensuring that the size you order will fit you perfectly.
5'3 - 5'5
160 - 165cm
5'5 - 5'7
165 - 170cm
5'7 - 5'10
170 - 178cm
5'10 - 6'1
178 - 185cm
6'1 - 6'3
185 - 191cm
The Ultra SL is available to order on cycle to work schemes.
We accept all major cycle to work scheme vouchers
Built for speed, the Ultra SL R/SL is a superfast aero bike that offers everyone from the everyday road rider to pro racers a significant performance advantage in their pursuit of speed. Its advanced aerodynamic frame and forks, optimised for outright speed gives you the power to dominate everywhere, from bunch sprints to alpine climbs or lone breakaways.