not faster you think you are going, because with 1.3 Conti Sport Contacts, my whole bike is lowered by 2cm. according to the garmin edge 800 on my bike, rocketron is 2063cm circumference, the 1.3 conti is only 1934cm.
i'm always running out of gears when i'm using mid chainring. until recently i forced myself to remember, conti = use 44T, rocketron = 32T