Specialized S-Works Roubaix SL4 Disc Red C2 – first ride review

Endurance race bike with SRAM Red hydraulic disc brakes

Our rating 
4.5 out of 5 star rating 4.5
USD $8,500.00

Our review

Believe us, this will challenge the best sportive bikes around
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According to Specialized, ‘S-Works’ means ‘born from racing’. That’s a little at odds with this version of the highly successful Roubaix Classics bike, because of its SRAM Red hydraulic disc brakes. These have yet to be sanctioned by the UCI for road racing. That said, after spending a few hours on the new SL4 Disc, we think S-Works might mean ‘born for racing’ in this case.


Note that this SRAM build will not be available in the UK, although British customers will have access to the lower spec Roubaix SL4 Expert (note: not S-Works) Disc Shimano Ultegra Di2 C2 (£4,500) instead. With disc brakes, too, that sounds like a pretty exciting prospect. The S-Works Roubaix SL4 frameset will be available in both US and UK territories for £2,600/US$3,500.

  • Pros: Smoothness in spades, exceptional tyres, spot-on handling
  • Cons: Brake noise, no UK availability

Ride & handling: Race handling with supreme comfort

Specialized’s Roubaix bikes always used to be ones that you bought with your head – sensible ride position, comfortable and well equipped (not forgetting the solid handling). They were the Volvo estates of the bike world. The SL4 changes all that. Its still impressively plush but the handling is livelier, with a tempered response that encourages speed and fun. 

In the S-Works guise it’s helped massively by the Roval Rapide 40 wheels. The stiff carbon rims are nice and neutral in crosswinds, and they run on DT Swiss-developed, disc-specific hubs and classy CeramicSpeed bearings. They’re shod with 26c S-Works Turbo tyres. We can’t wait to get our hands on the standard brake version of these wheels. 

Specialized s-works roubaix sl4 disc red c2:
Future Publishing

Specialized S-Works Roubaix SL4 Disc Red C2

The hot, bone dry conditions of Colorado’s Copper Mountain will flatter any tyre, but our first impression of the fat Turbo was good – it offered brilliant grip levels and a supple carcass we could feel deforming over broken surfaces and maintaining grip just when we needed it. Again, it’s something we really want to get some more time on, especially back in the UK where its mettle will be tested on more challenging surfaces. 

The rest of the bike’s components all come from the Big S. The deep, plush, gel-filled bar tape sits over a slick carbon fibre bar that feels suitably rigid, the tape adding comfort and eliminating fatiguing vibrations.

Frame & equipment: Top spec and endurance chassis

Geometry and ride position match those of last year’s SL4, which we found to be the most impressive Roubaix setup yet by a significant margin. It reinvented the Roubaix as a much more aggressive bike with a race-ready position while retaining comfort levels. Thanks to Specialized’s impressive COBL GOBL-R seatpost with its Zertz infused, leaf spring design, they’ve actually improved rolling comfort.

This SL4 comes with the SRAM Red 22-speed groupset matched to the hydraulic disc setup. At first sight some might be put off by the taller hood shape, but get beyond what’s just an aesthetic touch and you’ll find it superbly comfortable and a secure hold. We can’t help but think this hood shape is going to become a firm favourite of the disc-equipped cyclocross racer.

The braking doesn’t necessarily offer any more power than a standard setup. What it does improve, however, is the feel at the lever – being able to feed in just the right amount of pull to scrub speed makes it a faster bike to descend on. 

SRAM’s range-topping red disc brakes adorn the s-works roubaix sl4:
Future Publishing

SRAM’s range-topping Red disc brakes adorn the S-Works Roubaix SL4

It enables you to get your braking sorted with absolute confidence and then get straight back on the power, helped by shifting that’s slick, positive and rapid. As we found at the Red 22 launch, the discs can suffer a little from noise when heat gets into them – no power loss, just sonic irritation.


So, the S-Works SL4 does exactly what it should, and the equipment is all top grade (we’d expect nothing less on a bike of this price). What piques our interest, though, is that the frameset will be available from US$3,500, and the standard brake version at US$3,500/£2,600. The SL4 chassis has the potential to be one of the best endurance models on the market.

Product Specifications


Name S-Works Roubaix SL4 Disc Red C2 (14)
Brand Specialized

Description Tyres: 700x26c S-Works Turbo, 220TPI, foldable aramid bead, BlackBelt protection
Headset Type size-specific 1-1/8" upper and size-specific lower, hybrid cartridge lightweight bearings, 8mm carbon cone spacer, w/ 20mm of carbon spacers
Weight (kg) 7.1
Shifters SRAM RED 22, DoubleTap, 11-speed SRAM RED 22
Seatpost FACT carbon w/ Zertz, 27.2mm Forged alloy, Ti bolt, 32.6mm
Saddle Romin Pro, carbon rails, 143mm S-Works CG-R
Rims Roval Rapide CLX 40 Disc
Rear Derailleur SRAM RED 22
Handlebar 31.8mm S-Works Shallow Drop, FACT carbon, 125mm drop, 75mm reach Specialized Roubaix, w/ S gel
Bottom Bracket OSBB 50/34
Front Derailleur SRAM RED 22
Frame Material S-Works SL4 FACT 11r carbon, FACT construction, tapered/ shaped 1-1/8" to size-specific lower headtube, compact race design, Zertz, internal cable routing,
Fork Carbon OSBB S-Works Roubaix FACT carbon full monocoque, disc-specific, Zertz, size-specific 1-1/8" upper and size-specific lower
Cranks SRAM RED 22
Cassette 11-28t SRAM RED 22
Brakes SRAM RED, hydraulic disc, 160mm rotor SRAM RED, hydraulic disc, 140mm rotor SRAM RED
Weight (lb) 15.7