Smoother is faster. The more comfortable & less fatigued you are at the end of a 4-hour ride the stronger youll be. Like shocks on a race car the Zertz vibration damping inserts on the Roubaix SL4 help absorb road impact & keep power planted firmly on the roadcouple that with a FACT carbon 11r frame & its still plenty stiff to thrash around in a sprint. Just ask 2014 Paris-Roubaix champion Niki Terpstra. Build it up in the spec of your choice. Lightweight S-Works SL4 FACT 11r frame w/ Zertz offers smooth uncompromising ride quality S-Works FACT carbon monocoque fork w/ size-specific taper for ultimate steering precision Fast ultra-light Roval Rapide CLX 40 disc carbon wheelset with Ceramic Speed bearings Pro-quality long-lasting & lightweight Ceramic Speed bottom bracket w/ ceramic bearings Lightweight & efficient FACT carbon CG-R seatpost w/ Zertz vibration damping Technical Specifications FRAME 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 carbon OSBB FORK Specialized FACT carbon size-specific taper HEADSET 1-1/8" upper size-specific lower hybrid cartridge lightweight bearings 8mm carbon cone spacer w/ 20mm of carbon spacers BOTTOM BRACKET Ceramic Speed ceramic bearings FRONT WHEEL Roval Rapide CLX 40 SCS Disc w/ Ceramic Speed ceramic bearings REAR WHEEL Roval Rapide CLX 40 SCS Disc w/ Ceramic Speed ceramic bearings SEATPOST Specialized CG-R FACT carbon single bolt 27.2mm SEAT BINDER Alloy Ti bolt 32.6mm