Specialized Roubaix SL8 Pro Ultegra Di2 Road Bike 2025
We created the endurance road category two decades ago, proving that high ergonomics means high performance. Today, the new Roubaix SL8 with Future Shock 3.0 is lighter, faster, and smoother than any road bike ever made, unleashing unmatched confidence. The road may be hell below, but on Roubaix, it's always heaven above.
Compliance: Future Shock 3.0 is the star of the show, more tunable, adjustable, and durable than ever. Now, regardless of position on the bike, every rider experiences 20mm of smooth, stiction-free travel between the stem and head tube. Future Shock helps keep your hands and bars steady for a smoother ride with more control to stay fast, safe, and confident.
Our dropped clamp design exposes more seatpost to increase deflection, but “more” isn’t simply better. The Pavé seatpost controls that deflection for the optimal vertical compliance. Together, they create AfterShock technology, and when paired with the Roubaix’s rigid rear triangle, deliver a smooth ride with no loss in efficiency.
The Roubaix SL8 is the smoothest road bike our Ride Science Team has ever tested, reducing impacts at the bars and saddle by 53% compared to the nearest competition. With Roubaix’s Future Shock 3.0, the wheel quickly moves over the bump, while rider mass remains stable, maintaining momentum in rough terrain. Typical forks deflect backward on impact, causing a measurable loss in speed. It’s a scientific fact, smoother is indeed faster.
Capability: The Roubaix pioneered endurance geometry, so you ride “IN” the bike, not “ON” the bike to relieve pressure on your hands, arms, and shoulders for capability and confidence on any road, yet it’s ready to tackle a mountain descent at full speed. Snuggle up.
With tyre clearance up to 38c/40mm, this endurance road machine delivers better traction than ever on rough roads and even light gravel. Thanks to lightweight, super-efficient Specialized tyres, that extra tyre volume and traction come with no downsides.
Roubaix inspires really BIG days on the bike, so we’ve given it every mount your adventures could need—three bottle mounts, top-tube mounts, and it’s even fender-ready. So, go ahead and bring it all along for the ride.
Performance: The new Roubaix SL8 is our most aero yet, with new aero shapes from our Free Foil library and dropped seat stays. At just 950 grams, the frame is lighter, utilising lessons learned from the Aethos, the world’s lightest production frame, and Fact 10r carbon blend. Nothing in its class is faster or lighter than the Roubaix.
Technical Specification
| Frame Fork | Future Shock 3.3 with Smooth Boot, FACT Carbon 12x100mm, thru-axle, flat-mount disc |
| Handlebars | S-Works Carbon Hover Drop 125mm, Reach 75mm, with Di2 hole |
| Stem | Future Stem Pro |
| Handle Bar Tape | Supacaz, Super Sticky Kush Classic |
| Saddle | Body Geometry Power Pro Mirror, hollow titanium rails |
| Seatpost | S-Works Pave Seatpost |
| Seat Binder | Hidden drop clamp |
| Front Brake | Shimano Ultegra R8170, hydraulic disc |
| Rear Brake | Shimano Ultegra R8170, hydraulic disc |
| Chain | Shimano M8100, 12-speed with quick link |
| Crankset | Shimano Ultegra R8100 with 4iiii Power Meter |
| Chainrings | 50/34T |
| Bottom Bracket | Shimano Threaded BSA BB |
| Front Derailleur | Shimano Ultegra Di2 R8150, braze-on |
| Rear Derailleur | Shimano Ultegra Di2 R8150, 12-speed |
| Shift Levers | Shimano Ultegra Di2 R8170, hydraulic disc |
| Cassette | Shimano Ultegra, 12-speed, 11-34T |
| Front Wheel | Roval Terra CL II, 25mm internal width, 32mm depth, 21h, Tubeless ready, DT for Roval 350 hub, Centerlock disc, DT Swiss Aerolite spokes |
| Rear Wheel | Roval Terra CL II, 25mm internal width, 32mm depth, 24h, Tubeless ready, DT for Roval 350 hub, Centerlock disc, DT Swiss Aerolite spokes |
| Front Tyre | S-Works Mondo 2BR, 700x32c |
| Rear Tyre | S-Works Mondo 2BR, 700x32c |
| Inner Tubes | 700x28/38mm, 48mm Presta valve |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.
Specialized Roubaix SL8 Pro Ultegra Di2 Road Bike 2025 Sizing
Unable to display Reviews due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".
Unable to display Q&A due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".
Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
Save up to 47% with any one of our 11 Cycle to Work partners, and get the health benefits of a new bike in exchange for tax free salary sacrifice. To find out more about our various partners and how to apply click here.
Choose between Free Bike Delivery - to your home or place of work - or our new Premier Bike Delivery Service £99.99 and have your bike delivered "ready to ride" and set up to your measurements with seatpost and pedals adjusted on arrival by a qualified bike mechanic. Either way, our Customer Care team will be in touch to arrange a delivery date to suit you.
We've partnered with Laka to offer you 30 days free bike Insurance on your new bike purchase over £400. Click here for more info and find out how to claim.