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.
The smoother, faster Roubaix SL4 Expert C2 features a super light and stiff FACT 10r carbon frame with tapered head tube, Zertz vibration dampers, and full internal cable routing—the same design that Tom Boonen rode to win the 2012 Paris-Roubaix. Equipped with Shimano Ultegra Ui2 components, and DT Axis 4.0 wheels.
- Specialized FACT IS 10r carbon SL4 frame with Zertz is the fastest and smoothest endurance bike available, with size specific engineering, tapered headtube, ultra lightweight.
- All-new Specialized FACT carbon fork with Zertz has size-specific engineering that creates a more balanced and stable ride for riders of different sizes
- Specialized Roubaix Pro 120 TPI tyre has 23mm tread handles quick and fast while the 25c casing smoothes our ride and keeps you fresh longer
- Specialized Expert shallow drop alloy bar for serious performance; wrapped with non-slip Specialized Roubaix tape for vibration-damping
- Minimalist, high-performance BG Toupe RBX saddle with hollow Cr-Mo rails, flat profile and generous padding; partnered with FACT carbon Comp seatpost helps absorb road vibrations
- Adjustable four-position oversized alloy stem with 31.8mm bar clamp for strength and versatile positioning
- Shimano Ultegra compact crankset for legendary shifting performance
- New Shimano Ultegra Di2 10-speed electronic shifters for precise, hassle-free shifting, while Shimano Ultegra compact crankset keeps shifting butter smooth and laser accurate
Frame: Specialized FACT 10r carbon, FACT IS construction, tapered/shaped 1-1/8" to size specific lower HT, compact race design, Zertz, internal cable routing, threaded BB
Fork: Roubaix, FACT carbon full monocoque, Zertz
Bottom Bracket: OS integrated, sealed bearings
Brakes: Shimano Ultegra
Cassette: Shimano 105, 10-speed, 11-28
Chain: Shimano Tiagra 10-speed
Chainset: Shimano Ultegra compact
Front Derailleur: Shimano Ultegra
Handlebar Tape: Specialized Roubaix tape w/ 2.5 gel pads
Handlebar: Specialized Expert alloy, shallow drop
Headset: 1-1/8" upper and 1-3/8" lower Cr-Mo cartridge bearings, w/ 20mm cone spacer and 20mm of spacers
Pedals: Nylon flat test ride, loose ball, w/ reflectors
Rear Derailleur: Shimano Ultegra
Saddle: BodyGeometry Toupé RBX Comp, hollow Cr-Mo rails, 143mm
Seatpost: Specialized Comp, FACT carbon, 27.2mm
Seat Binder: Forged bolt and nut, 32.6mm
Shifters: Shimano Ultegra STi
Stem: Specialized Comp-Set 6061 alloy, cone head bolt, 12-degree, 4-degree shim, 31.8mm
Tyres: Specialized Roubaix Pro, BlackBelt, 120TPI, aramid bead, 700x25c
Tubes: Lightweight, presta
Wheels: DT Axis 4.0
Technical Specification
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.
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