Whilst pumping up my new tubular tyre, the head of the presta valve snapped off! Because this is a tubular tyre, I spent a lot of time (and cash) gluing it on and applying it etc, so I'm reluctant to buy a new tub. Is there any way getting a new presta valve head without replacing the whole tyre?Thanks in advance.
I personally wouldn't even try to replace the valve. It may not be completely air-tight afterwards. I also don't think you could pick up just a valve in a bike-shop. I think you'd be better off with a normal prester valved tube. Less hassle than gluing it all as you were saying :) I'm shocked to hear that it SNAPPED, did it snap completely or is it just un-usable? Edit - Corrected spelling.
Your broken valve will hold the air, but next time you pump air, the little screw will go into the tube and cause more damage. Replace it ASAP.
You will need a tube with a Presta valve installed. You cannot simply change the valve stems on your existing tubes. I have been riding Presta tubes in Schraeder rims on my mountain bike for years. I cut a piece of old inner tube about an inch in diameter and poked a hole for the Presta stem to go through. This has been enough of a gasket to keep the tube from being damaged. There are grommets that you can buy at bike shops to take up the slack, but I have never found them really necessary.
This Site Might Help You. RE: Presta valve snapped!? Whilst pumping up my new tubular tyre, the head of the presta valve snapped off! Because this is a tubular tyre, I spent a lot of time (and cash) gluing it on and applying it etc, so I'm reluctant to buy a new tub. Is there any way getting a new presta valve head without replacing the whole...
By the head of the valve, do you mean the lock nut? The part you unscrew to press in to release pressure? If that is what you mean, it has happened to me several times. It is usually from the way the pump is applied or released from the valve. Hand held pumps cause it more than floor pumps. The thin screw that the nut tightens on simply snapped. It can even happen on a presta inner tube. You can just inflate and ride with the nut broken off. Shouldn't be a problem. If it is like any tubular I have used the valve core is replaceable. This is because tubs come with one length valve and for dish wheels you need to install an extension. Ask your bike shop if you don't know or look up the manufacturer's site for the brand tub you have. They usually say if it has a removable valve. If they don't come out and specify if the valve is removable or not, if they sell extensions for their tires it is replaceable. The extensions are supplied with a little tool to remove and tighten the valve. Simple pliers can be used if you are careful not to squeeze the valve too tight.
