Is it the pump?

[The Jogger]

I was pumping up the rear tyre on my commute bike which has a marathon plus on it. I read the wall as it was recently exchanged from a hardcase lite, it said max 95psi so I put probably just over into it. I checked the back and then went to check the writing on the rear tyre again, just as I got close up to it to read, it went pop no it went bang and so did I.

Now should it have exploded the tube that is at 97psi it was completely ripped or would it be a false reading on the pump?

 

[smokeysmoo]

The tyre didn't do anything, the tube went pop and probably popped the tyre off the rim, that's if my own experience of blowing tubes is anything to go by. They do go with a bang don't they? The last one that went on me was in the living room as well, I thought the feckin' ceiling was coming down!

What was the max psi of the tube, how old was the tube, had the tube been patched, etc, etc, etc. You see where this is going.

Stick a new tube in, re-seat the tyre and inflate within the parameters and all should be well.

 

[Diggs]

Doesn't sound like it but the only time I have ever done that I heard of that happening was when I a friend of mine forgot to put rim tape on a new wheel. How foolish was that?

 

[The Jogger]

Thanks, it was the original tube on with no patches, those bonito tyres do the trick but the lbs's don't sell them. Yes the tyre did come off the rim, I will do as advised, thanks again.

 

[Old Plodder]

Sounds as if you may have trapped a bit of the tube under the bead when fitting the tyre.

 

[Pat "5mph"]

Btw, my Marathon plus sidewall says max pressure 85 psi? Maybe reading glasses are needed?
Probably trapped tube, as Old Plodders says. How do I know this?

 

[snorri]

Btw, my Marathon plus sidewall says max pressure 85 psi? Maybe reading glasses are needed?

I think tyre manufacturers could help us all by making the data moulding a little more conspic.on the tyre walls. I was assisting a friend just yesterday with some tyre advice in bright sunlight and we struggled to find and interpret the Max Pressure figure.

 

[Shut Up Legs]

The max pressure depends on the tyre size: my 700x28c Marathon Plus tyres have 100psi max, whereas larger tyres such as 35c have (I think) about 85psi max.

Tubes can pop due to faulty tyres. I had a faulty Marathon Plus tyre about 2 years ago, which came off the rim several times, due to the bead not being formed properly. This of course immediately caused the tube to pop, with a very loud **bang**. I eventually had to throw the tyre out.

 

[Pale Rider]

There seems to be an arms race on bike forums to put more and more pressure into tyres.

"I run 100psi' or 'My pump runs out of puff at 110psi,' or 'I know it says max 60psi on the tyre but I run 90psi no problem.'

Take a step back, look at the maker's recommendation and operate well within it.

That extra 10 or 20psi may make a difference to a pro on the track, but it makes no important difference to a leisure or commuting cyclist.

 

[The Jogger]

Btw, my Marathon plus sidewall says max pressure 85 psi? Maybe reading glasses are needed?
Probably trapped tube, as Old Plodders says. How do I know this?

Maybe stronger reading glasses are needed

 

[The Jogger]

The reason I put max air in, is because I heard it helps you avoid punctures, definitely not speed for me. Although with marathon plus I would hope that is less of a problem.

 

[The Jogger]

I just put on a new tube and the tyre went on amazingly easily from what I've heard about M+ tyres. The problem was when I went to inflate it, I won't say blow it up as I did that yesterday. I gave it a few pumps and then the pump feels like it is there but the tyre only feels half inflated, if that. What could the problem be?

 

[Fab Foodie]

I blame the Government .... always to blame for inflation rising ...

 

[sazzaa]

There seems to be an arms race on bike forums to put more and more pressure into tyres.

"I run 100psi' or 'My pump runs out of puff at 110psi,' or 'I know it says max 60psi on the tyre but I run 90psi no problem.'

Take a step back, look at the maker's recommendation and operate well within it.

That extra 10 or 20psi may make a difference to a pro on the track, but it makes no important difference to a leisure or commuting cyclist.

I prefer to run at less than max psi, makes the ride smoother!

 

[Downward]

I have gone 6 years nearly with a track pump with no gauge. From reading reviews of how many pumps to get to 100 - 17-25ish I have probably only done 8 or 9 !

Interesting to see when my new pump with gauge comes how much pressure i have been putting in over the years.