CO2 inflators

t4tomo

Is it the done thing to back off a bit of air from the tube one inflated.

I've never used one before but my mate had a puncture last night in the last 10 miles or so of our ride. Did a quick change, checked inside of tyre etc which I'm pretty sure was fine. He had a co2 cartridge with him so he used that to inflate it, which I have to say I might now be a convert to gas as it is a lot quicker than a pump.

Tyre did feel rock hard ( and valve and rim were very cold) anyway we got going again but it went with a huge bang about 3 miles later.

Changed again, luckily I had a tube with me, inflated by leyzne pump and it was fine for rest of ride.

So either it was a bit off flint still in there, but I didn't find it second time, but not sure that would have caused a " bang" more a "pssssst" like the first puncture. So I'm maybe thinking it was over pressured.

So back to original question, as you don't seem to be able to regulate how much air goes in,,do you let a bit out if it feels too hard?

cgfw201

always just gone with it personally, never had an issue having used CO2 well over 10 times on flats over last few years.

only thing to bear in mind is to deflate the tyre and reinflate with normal air when you get home as CO2 leaks from latex tubes.

ben@31

Pinch flat? Part of the inner tube trapped between the rim and tyre? From what I've read when buying CO2 inflators I did not find one that went over 90 to 100psi.

fenix

Yeah I bet he got a bit of tube trapped in the tyre.

Co2 is a stop gap thing to get you home = as they say it leaks out faster than air so you need to pump it up properly.

What did his tube look like on the second puncture ?

t4tomo

Must confess I didn't bother looking to see if it was punctured on inside or outside of tube, it was getting darkish so just cracked in with getting it replaced. But if it was trapped twixt tyre and tube it wouldnt have lasted the 3 miles and I had done a part inflate with normal pump when fitting it so don't think it was that, they normally go as you re pump them up of that's the case

It just blew with an almighty bang as we were slowing up approaching a junction on a smooth bit of road.

paulbnix

We have two different CO2 inflaters and with both you can control the flow.
Mine is an Aldi one with a turn valve and my mate's is from https://www.tyreinflators.co.uk/index.php?act=viewCat&catId=23 that you control lifting it off the valve.

sungod

if the tube went 'bang' it was outside the tyre, it has to expand until bursting point, as it bursts there's sudden release of pressurised gas causing the bang

this expansion cannot happen inside the tyre

either the tyre was damaged so the tube forced through a cut, or the tyre wasn't seated on the bead so the tube could force out, but most likely the tube was nipped between bead and rim, it can take ages for the tube to be forced through and burst

t4tomo

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19680045#p19680045]sungod[/url] wrote:

if the tube went 'bang' it was outside the tyre, it has to expand until bursting point, as it bursts there's sudden release of pressurised gas causing the bang

this expansion cannot happen inside the tyre

either the tyre was damaged so the tube forced through a cut, or the tyre wasn't seated on the bead so the tube could force out, but most likely the tube was nipped between bead and rim, it can take ages for the tube to be forced through and burst

Bollox, a tube can give out regardless of whether RIT has a tyre outside it, I've ridden behind a guy whose tube went bang after a longish descent on the breaks. Tube defiantly inside tyre just over heated rim.

sungod

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19680212#p19680212]t4tomo[/url] wrote:

Bollox, a tube can give out regardless of whether RIT has a tyre outside it, I've ridden behind a guy whose tube went bang after a longish descent on the breaks. Tube defiantly inside tyre just over heated rim.

1 were we discussing people overheating their rims on long descents? no, you need to learn context

2 at no point did i state that a tube could not fail inside a tyre, merely that it could not go 'bang', you need to learn englsh

3 the 'bang' in the overheated rim situation was caused when the presurised gasses escaped the tyre, the tube did not go 'bang' inside the tyre, the tyre would need to have unseated following the initial lowering of pressure until the bead was no longer held tight enough to prevent the final sudden decompression outside the tyre, which is what causes the 'bang', you need to learn causality and physics

oh, and courtesy, you need to learn about that too

cougie

Yes that was a bit rude. Asking for an answer and getting arsey.

Odd to not check for the cause of the second flat. You'd be likely to get a third if it was something in the tyre but as has been said the tube sounds to have got caught in the tyre.