Michelin a3 protek max road bike tube how many road bike or mountain bike rides have been ruined by a flat regardless of whether its a puncture or a pinched flat the cyclists hopes for the days outing are dashed repairing or changing an inner tube is never easy even for an experienced rider many users have lost their patience given the many steps involved in repairing a flat tire as a result the inner tube has become the achilles heel of cycling or at least it was until michelins adv