4 tubes destroyed same day on the same spot – my mechanic said never saw something like this! There is nothing sharp in tyre, so what’s wrong?!
by to3cutter
4 tubes destroyed same day on the same spot – my mechanic said never saw something like this! There is nothing sharp in tyre, so what’s wrong?!
by to3cutter
16 Comments
That looks like a blow-out from to tire not being seated at the valve. Are they blowing up on install or while you ride?
a blowout like that usually indicates a hole in the casing of the tire.
You cannot get a big rupture like that unless the tube is exposed to open air outside the tire.
Considering that it’s opposite to the valve, it’s possible that you left the tube pinched between the rim and the tire when you installed the tire. After I have installed the tire on the rim, I give the valve a little push into the tire just just to make sure that the tube is not left pinched.
The other possibility is that you have a big cut in the tire, so that when you pump the tire the tube is pushed out of that cut.
….or the tire was not seated properly.
I would try swapping tires front to back, or at least marking the spot on the tire and move it 180 degrees from the valve…see if the problem follows the tire or stays in the same spot immediately next to the valve.
Also, are you using the same brand tube every time? since they’re all failing in the same place and you had a mechanic confirm nothing is wrong with the wheel or tire, I wonder if there was a bad batch of tubes?
Definitely looks like the inner tube was stuck under the tyre.
Install another tube and then push the tyre into the centre of the rim and check that you can’t see any tube there.
I like the coloured TPU tubes for this – you’re not going to miss a bright pink tube.
switch to TPU tubes. they are way better and lighter too
Is it the super light tube or normal weight tube?
Weird, but I would check the tyre. It is common to put tyre always the same way – tyre logo and tube nipple in the same place on the wheel (it helps to find nipple faster, also helps in puncture repair and finding holes). So check your tyre where the logo is.
Or switch front and back tyre, maybe it will help to pinpoint the problem.
I know my shop has had issues with faulty bulk tubes lately. Not saying this is the issue but it has been happening at my shop of late.
My opinion, the tire casing is done and failing to contain the pressure placed inside of it.
Hope you can resolve this obstacle.
I remember using a smaller diameter tube and having a similar result. Try talcum powder in the tire first? Perhaps the tire is shifting a bit under your immerse watts. Go tubeless.
Is the tube the right size for the tyre? If the tube is too thin this is exactly where it’d blow out. Can happen without riding too. Know it’s unlikely but worth a punt.
I brought a tube from the bike shop a few years back in peak Covid and I put it in and split within 2 miles
Went back about two days later to get a new tube and I wasn’t given one but given a refund for one I already brought (I’m a regular)
Turns out for a bike shop had a bad batch and everyone who bought a tube was coming back and splitting new tubes in the same spot. The distributor had pulled a very old box they thought they could sell and it turns out the rubber had perished
Could be using a tube for a smaller width tyre on a wheel that has a bigger tyre on it.
I once got excited when I received some new 35mm World Tour tyres (going from 23mm tyres) and I only had my old tubes (forgot I’d need to buy bigger ones).
I thought I will mount them up so I can go for a quick spin that night before going to get the right sized tubes the next day only to have the tubes explode a few minutes after inflating them (luckily before I had been able to get the bike out to start riding).
The tearing looked exactly like your photo.
Likely a blowout resulting from the tube getting between the tire bead and the rim. Next time, before inflating, push the valve down so that the tube clears the gap between the bead and the rim hook. IMO, that’s standard procedure. Years ago, when I was a shop rat, I saw dozens of these.