A few other test riders at Cervélo's Arizona launch commented that the bike seemed a little more comfortable than previous iterations. Cervélo lead engineer Graham Shrive said that comfort is harder to quantify than stiffness. "It's easy to make the seat tube really stiff; just run high modulus fibers all the way the down seat tube. The problem with that is it doesn’t lend itself to comfort. Instead, we’ve used things like 25-degree fibers and given them a little bit of a twist to deflect some of the impacts. Also, there is a certain decoupling with the frame seatpost clamp bolt and the single bolt at the saddle. And having the wider rims makes for wider tires. Anywhere we could have looked at comfort we have.