So lets say I have a tire that is rated at 35 PSI. It is an 47-559 tire, or a 44 mm wide tire on a 26" rim. Since I am heavy, almost 280 lbs, 35 PSI doesn't quite cut it for me, tire is almost on the ground. I have pumped it up to 45 or 50 PSI and it is about right to carry me. So my question is - is this over-inflation dangerous? The tire is currently pumped up 30% more then rated pressure, so I am concerned what could be the consequences? What is the danger of over-inflation besides getting the tire blow off the rim?

This one seems seated quite well, was hard to put on and it looks unlikely to blow off the rim. I have ridden it at 45 PSI in 100°F weather today and it held up fine. So the big q is - is it safe to do so in the long run? I'm using it as a front tire, so it is imperative that it is safe to do so.

http://www.savatech.eu/pdf/bici_slo-ang.pdf
It is listed under classical tires - 47-559 with tread pattern V13.

What is confusing is that under MTB tires there is listed an 47-559 tire with a tread pattern B42 that is rated for up to 65 PSI. Tire seems identical to this one I bought, so I cant make out why are they rated for different PSI. Anyone can explain?