The best balance of low frontal drag and crosswind stability the 45mm deep 25mm wide rim with integrated tyre design creates an aerodynamic wheel that inspires confidence in crosswinds perfect efficiency and low weight 17mm internal rim width offers low rolling resistance with 25mm tyres giving you low friction and fast engagement the instant drive 360 freewheel gives you a fast and smooth ride with the rear wheel weighing in at just 945g this wheelset will keep your climbs fast lateral st