BF just got me a floor pump with a pressure guage for my birthday. So I thought I'd check the tyres and pump them up to full pressure. I looked at the tyres and the rear tyre said max pressure 85psi, the front said max 75-100psi. So I pumped the tyres up to 75psi and headed off. Only got a couple of meters down the road and there was a loud pop under my bum. Turns out the rear tube exploded. So I walked home again. Tyre looks fine, but tube is busted. Now my question is, what pressure should my tyres be at? I'm on a Specialized tri-cross sport, but can't remember what the tyres are. The front is the one that came with the bike, the rear (where the tube blew out) is something from Continental. Not road bike tyres, a little wider and more tread. More like a hybrid bike I suppose.