MICHELIN TR: - Quality at less cost! - 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 in higher performance tyres, with the exception of Down Hill tyres, they are nonetheless of very good quality.