Another pet hate about pro-helmet crusaders; of whom one of my cycling buddies is one..... I warned him weeks ago about a large bulge in the sidewall of one of his tyres - it looked ready to pop at any time, and as he is quite a high mileage rider I thought it would be a wise move to change the tyre. But no, he kept riding on it for several hundred miles and today the inevitable happened; the tyre blew out. Fortunately it was on the rear wheel and happened at low speed so he stayed on the bike - but that was just good luck. What is it with riders who lecture me about wearing a helmet, yet they feel it is ok to neglect obvious safety issues like a bulge in a tyre?? Do they feel invincible because of a thin plastic shell perched on their head?