There are two types of personal trainers in the worlddrill sergeants and cheerleaders the roll elite low entry is the latter kind in bicycle form with its lightweight alloy frame and fork a comfortable upright geometry that makes getting on and off the bike a breeze stable and wide 650b tyres and powerful mechanical disc brakes the roll does everything in its power to encourage motivate and inspire you to get out and keep fit in comfortable efficient style wide diameter 650bx23 n