And here is where you show ignorance. I can't speak for the UK, but there are standards in the USA, and I'm fairly certain that Germany has DIN standards covering tire pressure ratings and blowoff pressures of bicycle tires. Certainly, reputable manufacturers maintain their own standards.

The fact is that you have absolutely no credentials to debate this, and are basing your conclusions on having read one or two articles about pressure.

Had you limited your nonsense to a discussion of practical or recommended pressures this thread would have ended long ago, but you insist on saying that the marked ratings are lies while offering zero by evidence, or citing a single authoritative source.

Meanwhile you speak of confusing people, but you're the only one confusing anybody. The OP asked for help understanding how/why his tube blew off, and a number of stepped in to address that specific issue. You OTOH chose to make it a jumping off point for a nonsensical rant about the markings being silly, and folks who accepted them at face vaue being gullible.

All this did nothing to help the OP understand how his tube could have blown due to poor seating, or other things in his control.

Long ago I added the Alexander Pope quote below my signature, but if I hadn't done it then, I probably would have done so now.

+1 I agree 100 % , now can we for once and all close this tread and he (steren) can leave it alone .

Actually, I'm hoping the OP will come back, telling us the location and shape of the tub's rupture.

I agree , that would be nice to hear .

FB,

You are, as usual, correct regarding the relevant standards:
See International Standard ISO 5775-1:1997, Bicycle tyres and rims — Part 1: Tyre designations and dimensions

http://www.iso.org/iso/catalogue_det...csnumber=25326

Not a casual read perhaps but relevant to tire manufacturing process design and control.

Gee, I love process design, implementation & control almost as much as quality assurance.

OP:
If your tire is not seated correctly it can blow off the rim. Try again, just don't pinch the tube.

-Bandera

mmm this will be tricky to explain since the old tube is now in somewhere in the city trash. There was a hole right along the middle, about 3 inches long and about as wide as the tube itself. It was roughly opposite to where the valve is located. Although I was told that something could've been potentially wrong with the rim or the tube had been poorly seated, the mechanic found nothing wrong with the rim and he didn't mention anything wrong with the bike. My bike has received its first tune-up, and as of now, I am riding with both tires at 70 psi (The way it left the shop). The bike feels very good and the tires do not squish under pressure.

I probably should mention again that when I inflated to 100 psi, the pump piston started to feel incredibly hard - it was quite an effort to do that. (Is that normal, anyway?)

Very Good, keep riding.

Read this:

http://sheldonbrown.com/flats.html

-Bandera

Here's another possibility, but it would only apply if you have narrow rims.

When a tire is mounted (see sketch) there's a sort of hourglass shape, with the tire above, then a narrow area between the beads (3), and the space inside the rim below the beads.

As you fill the tire, the properly positioned tube fills the tire at about 5psi, spanning the narrows. With more pressure, the section across the narrows blows down into the space below. Since the tube is sticking against the tire, only the narrow section expands, so it's effectively stretched 2-3x the rest of the tube. The end result is that this hyper-stretched section can burst, just like an overinflated balloon.

If this is the cause, you'll see evidence in the form of stretched areas elsewhere on the belly side of the tube.

Meanwhile if the tire is handling nice at 70psi, you might as well stay there, though there's no assurance you won't have the same problem, nor that more air will trigger it.



.

Yes, pumping force is directly proportional to pressure. The pump is a piston, and the force needed is equal to the pressure X the cross sectional area of the pump's cylinder. That's why high volume pumps are fat (move lots of air per stroke) and high pressure pumps thin, don't move much air, but have a better ratio of pressure to pumping force.

Actually Sreten is going to leave us all alone due to a permanent ban.

Fantastic info - thanks :thumb:

Yes , I know I reported him about how he treated me and yes he been ban .