Although at only a shade over 7kg, the Cervélo S5 is hardly a heavyweight, it’s clear where Cervélo’s priorities lie with the latest iteration of their wind-defying superbike, which will save you a claimed 21.3 watts over the previous model.
Read more at http://www.cyclingweekly.co.uk/reviews/road-bikes/cervelo-s5#DMp6r7JFemDAHRqI.99