Blown valve?

[The Bear]

Spent last night planning an epic ride to for today. Noticed this morning my rear tyre was a little soft so started to remove the dust cap and it shot out of my hand with the inner tube deflating rapidly. Looks like the valve has blown out of my tube.

So what might have caused this? Is it just a rotten piece of bad luck?

 

[Fordulike]

I think the valves just screw in, so if it wasn't tight in the first place, vibration could have caused it to loosen.

 

[The Bear]

Ive never experienced it before, despite having these valves on various bikes in the past. Maybe I bent the internal part last time I inflated the tyre? Im thinking of getting some of those Presta/Schrader adapters to make life easier. The Presta valves do seem temperamental.

 

[mike killay]

Surely that is a schrader valve?
Have you tried screwing the core back in?

 

[The Bear]

Surely that is a schrader valve?
Have you tried screwing the core back in?

Its a Presta valve, but the middle bit blew out as soon as I removed the dust cap, and is probably now half a mile down the road!

It now looks like a Schrader valve, because the middle part is missing.

 

[argoose]

The thread looks ok, try your LBS for replacement valve core

http://www.wiggle.co.uk/lifeline-universal-tubeless-presta-valve/

 

[The Bear]

The thread looks ok, try your LBS for replacement valve core

http://www.wiggle.co.uk/lifeline-universal-tubeless-presta-valve/

Didn't realise they could be purchased separately. I ended up buying a replacement inner tune which I fitted earlier today. Spoilt the ride I had planned though!!

 

[soundwave]

http://www.chainreactioncycles.com/lifeline-presta-removable-valve-core-pack-of-4/rp-prod161980?gs=1&utm_source=google&utm_term=&utm_campaign=Chain+Reaction-UK-PLA-PLA-All-DT-SE-Shopping+QLB+Generic+Desktop&utm_medium=base&utm_content=mkwid|sDhAuqp2Y_dc|pcrid|161850070953|pkw||pmt||prd|597334UK

 

[Deleted member 4366]

I've had that loads of times. It can loosen when you take the pump off after pumping up, then come right out with the dust cap. It's nothing to worry about - just screw the valve back in.

 

[grldtnr]

....if you've got it! Used to get spare ones with the better puncture repair kits, haven't come across one for somewhere.