The S-Works Tarmac SL4 is a pure racing machine. It climbs effortlessly, descends confidently, and sprints ferociously. It's the lightest, stiffest frame Specialized made and it shows as soon as you push on the pedals. Bottom line, you'll be faster on this bike. There's a reason it's the weapon of choice for the Saxo-Tinkoff, Astana and Omega Pharma-Quick-Step Pro Tour teams.