Specialized S-Works Tarmac SL4. The SL4 has been in the range for three years now but it’s still a fine bike in terms of its lightness and stiffness.
As is the case with most top-end performance bikes, the SL4 comes with a tapered head tube/fork steerer. Although Specialized go with a standard 1 1/8in upper bearing, the lower bearing is a far more unusual 1 3/8in, the idea being to provide confident handling and sharp steering.
