Michelin protek urban city tyre the michelin protek urban tire also boasts the new generation of aramide fiber michelin anti puncture reinforcements features michelin tr when designing their cycle tyres michelin use two types of bead flexible beads ts and rigid beads tr the traditional design of cycle tyres uses rigid beads generally made of steel this material is heavier than the aramide fibres used in making flexible beads but its much cheaper although used little or not at all i