BMC Racing, Team Blanco, FDJ, Omega Pharma, Orica-Greenedge, Argos Shimano, Sky: just some of the teams that were running 25mm tyres this year. 700c x 23mm is no longer the norm, pro teams are switching up to bigger profile rubber all over the peloton, with research showing that it can provide significant gains both in terms of aero-dynamics, grip and comfort. I’ve long been running 25mm tyres on my winter/touring bike as it helps to cushion the load better, provides a bit more grip, and is less susceptible to pinch flats when the bike is heavily burdened. However, for racing I have always used Conti GP4000S tyres with 23mm profiles, or at the most extreme I tried a 21mm Vittoria for a time trial once. That might no longer be the case... The thinking was that the smaller profile tyre has a lower surface area, so lower rolling resistance and also less weight (rotating weight as well, so even more significant). 25mm tyres were only to be used on particularly rough terrain an