Description
Specialized S-Works Tarmac SL8 Ultegra Sigma Exclusive Road Bike
Built around Specialized's top-tier FACT 12r carbon frame, the S-Works Tarmac SL8 delivers an unmatched combination of aerodynamic speed, featherweight climbing capability, and razor-sharp handling. Engineered in the wind tunnel and refined using Rider-First philosophy, this machine cuts through headwinds with effortless efficiency while maintaining a remarkably smooth ride over rough asphalt. Equipped with the buttery-smooth electronic shifting of a full Shimano Ultegra Di2 disc groupset and fast-rolling Roval Rapide C 38 carbon wheels, it transfers every watt of your power directly to the road. Wrapped in tacky Supacaz handlebar tape and anchored by an ergonomic Specialized Power saddle, every contact point is crafted to keep you performing at your absolute peak during grueling miles and high-speed sprints alike.
Pro-Level Precision with Electronic Shifting
At the heart of the ride experience is the legendary Shimano Ultegra R8170 Di2 groupset, offering lightning-fast, fully customizable electronic shifting that operates flawlessly under heavy load. Hydraulic disc brakes deliver immense, predictable stopping power in any weather conditions, giving you total confidence through technical descents and tight hairpin turns. Up front, the fully integrated Roval Rapide cockpit hides cables away from the wind, dramatically reducing drag while providing a clean, aggressive aesthetic. Paired with supple S-Works Turbo TLR tubeless-ready tyres, this setup grips the road through high-speed cornering and minimises rolling resistance, ensuring you get maximum output from every single pedal stroke.
Customisable Options & Component Specifications
Because every cyclist's biomechanics and riding goals are unique, this exclusive build serves as a high-performance foundation that can be completely tailored to your specifications. Through our bespoke service, key components can be swapped and optimized prior to delivery to ensure a factory-fresh, perfect fit right out of the box. Adjust your gear ratios with a wide selection of crank lengths and cassette sizes, tune your handling with tailored stem length and handlebar width options, or upgrade to your preferred tyre width and tread pattern for maximum clearance and comfort.
Technical Specification
| Frame | S-Works Tarmac SL8 FACT 12r Carbon, Rider First Engineered, Win Tunnel Engineered, Clean Routing, Ceramic Speed SLT Headset Bearings, threaded BB Shell, 12x142 mm thru axle, flat mount disc |
| Fork | S-Works FACT 12r Carbon, 12x100 mm thru axle, flat mount disc |
| Seatpost | S-Works Tarmac SL8 Carbon, FACT Carbon, 15 mm offset |
| Seat binder | Tarmac integrated wedge |
| Headset | Stem headset spacers kit for SL7 stem & Roval Rapide cockpit use |
| Handlebar | Rapide Road Integrated Cockpit |
| Groupset | Shimano Ultegra R8170 Di2 Disc Bike Groupset |
| Bottom Bracket | Shimano Ultegra 6800 Bottom Bracket - ITA |
| Cables | Shimano EW-SD300 E-tube Di2 Electric Wire |
| Wheelset | Roval Rapide C 38 Disc Wheelset |
| Bartape | Supacaz Super Sticky Kush Single Colour Bar Tape |
| Tyres | S-Works Turbo TLR Road Bike Tyre |
| Saddle | Specialized Power Evo Comp Saddle |
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.
Size Guide
Specialized S-Works Tarmac SL8 Ultegra Sigma Exclusive Road Bike Sizing
Delivery & Returns
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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 42% 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.
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