I actually get excited when my back tyre looks tatty n worn. <?: prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Believe it or not it actually helps you become a better MTB?er ? Makes you a better climber by forcing you to remain seated on climbs. ? Actually makes you faster as there is less rolling & braking resistance. So my advice is to either save it for a big training ride / race day OR Go big and ride that sucker to the canvas!!! whilst showing the boys how to how to slide into a corner using just the back brake!!!