Revolution g isotech rigid tyre the vittoria revolution g isotech rigid tyre ideal as a city tyre and also for rides just off the beaten track the g isotech is vittorias unique graphene compound which offers lower rolling resistance when compared to the same product without the compound the strong tread pattern is designed for lots of miles features vittorias prb 20 breaker for excellent puncture protection weight 28mm 550g 32mm 590g 35mm 620g 38mm 680g