In February of 2013, I switched to a Specialized Roubaix Armadillo Elite for the rear tire of my De Rosa Professional bike.
Last month, I finished building up my Eddy Merckx Professional. After some research, I decided to use Continental Grand Prix 4000S
I attributed the difference to the tires. I can’t complain about punctures with the Specialized Roubaix Armadillo Elite – I don’t think I got one in 5800 miles. As is evident in the photograph, it did wear into a large, squared off, contact patch, 9/16″ (14mm) wide. I switched the rear tire on the De Rosa to a Continental Grand Prix 4000S and the De Rosa no longer feels like a truck.