Jul 12, 2012 · The Roubaix SL4 borrows a number of design features from the Tarmac, Specialized’s no compromise racing bike.The frame of the SL4 was beefed up considerably compared to the Roubaix SL3 ...
The New Specialized Tarmac review This month Specialized announced the newly designed Tarmac which continues the evolution of their successful Tarmac SL4. But calling it the SL5 would imply that...Geometry. Rider Reviews. Back To Top. The Tarmac SL4 is a pure and unbridled race machine. It climbs effortlessly, descends confidently, and sprints ferociously. It's the lightest, stiffest frame we make and it shows as soon as you push on the pedals. Bottom line, you'll be faster on this bike.