Smoother is faster. The more comfortable and less fatigued you are at the end of a 4-hour ride, the stronger you'll be. Like shocks on a race car, the Zertz vibration damping inserts on the Roubaix SL4 help absorb road impact and keep power planted firmly on the road couple that with a FACT carbon 8r frame and it's still plenty stiff to thrash around in a sprint.
The Specialized Roubaix SL4 Comp Disc 2015 Features are:
Frame: Specialized SL4 FACT 8r carbon, 1-1/8" to 1-3/8" headtube, compact race design, Zertz, internal rear brake cable, OSBB
Fork: Specialized FACT carbon, size-specific taper
Headset: 1-1/8" upper, 1-3/8" lower, Cr-Mo cartridge bearings, 20mm cone spacer, w/ 20mm of spacers
Bars: Specialized Comp, shallow drop, 6061 alloy, 125mm drop, 70mm reach
Stem: Specialized Comp Multi, 3D forged alloy, 4-bolt, 12-degree rise, anti-corrosion hardware
Speed: 22
Front Mech: Shimano Ultegra
Rear Mech: Shimano Ultegra
Shifters Shimano 685
Chainset: Praxis Works, TURN Zayante, BB30, 50/34
Cassette: Shimano 105, 11-speed
Chain: Shimano 105, 11-speed
Front Brake: Shimano 785, hydraulic disc, Ice Tech resin pads w/ fins
Rear Brake: Shimano 785, hydraulic disc, Ice Tech resin pads w/ fins
Rims: AXIS 4.0 Disc
Front Hub: AXIS 4.0 Disc
Rear Hub: AXIS 4.0 Disc
Spokes: AXIS 4.0 Disc
Tyres: Specialized Turbo Pro, 127TPI, folding bead, BlackBelt protection, 700x25c Front Specialized Turbo Pro, 127TPI, folding bead, BlackBelt protection, 700x25c Rear
Seatpost: Specialized CG-R, FACT carbon, single bolt, 27.2mm