Smoother faster lighter more controlwe could go on and on when it comes to the all new roubaix expert with shimano ultegra di2 if we were to describe it in one word though it would be revolutionary the frame is the lightest that weve ever made and its been constructed from our fact 10r carbon fiber its stiffness levels are also off the charts and compared to the sl4 iteration of yesteryear youll experience a whole new faster and more efficient geometry through some engineering