Continental Conti Valve Extender (Pack of 2)

Works great good normal valve extender

This is a terrific product. My wheels have deep rims, and the tube for my front wheel only comes with a 40mm valve stem, which makes it difficult to get a good seal with the pump. I bought the 20mm valve extender and installed it with no problem in about 10 minutes. As suggested in several Youtube videos, I used a little bit of Teflon plumber's tape on the threads to ensure a good seal. Now, the pump engages with no problem, and the valve does NOT leak at all. I should have done this a long time ago.

I got frustrated too with these valve extensions not allowing much air in or out if any at all after installing them in the tube. I then performed the trick that a reviewer called Dan Martin mentioned in here by removing the original valve stem core that came with the tube and putting in a different core which also worked for me so, you'll have to buy an aftermarket different core brand which Amazon sells plenty of and problem solved. Funny though the original and aftermarket valve cores look identical but only the aftermarket will work and fix the problem. Also, if it leaks a little of air at the bottom of the extension just add a bit of Teflon tape on the threads to fix the leak as suggested by others. I have to say this guy is very smart and intuitive and his great idea helped many of us. Thank you Dan!

First off I want to point out that these didn't work for me as I thought they would have. I was setting up 50mm carbon rims, tubeless, forgetting the fact that I need the stems to be fastened to the wheel. These are not threaded to receive a holding nut and can easily be pushed into the rim causing air leakage. However, as a product these are a much better option than using extenders that screw over the presta core, where it is hard to check pressure with a standard gauge and needing to stick a piece of wire or spoke down the shaft the release air. The presta core screws right in to the stem allowing to easily achieve the a fore mentioned tasks. Definitely use a little Teflon tape on the threads before screwing into valve stem.

READ THIS! If you are putting these extenders on Conti tubes and reusing the same cores, you might find it nearly impossible to pump air. Get rid of the Conti core and you should be fine again. This "bug" made me regret buying this product until I discovered this workaround. I had just gotten a new specialized aethos and was installing new tubes and tires but realized too late that the county tubes I ordered didn't have stems long enough for the new carbon wheels. The tubes that came with the bike were too narrow for the tire I was installing, so I took the cores out and used them in the new tubes with the extensions. Everything worked fine once I did that.

I use these with latex tubes on Campagnolo Bora Ultra WTO 45 wheel sets. Never had a leak or any other problem. Gets the job done, no fuss.

I have a Dahon folder which came with deep rims and tubes with long, long valve stems. When I wanted to add sealer against thorns, I could not find tubes with removable presta valve cores that had a stem long enough to fit the rims. Their valves just barely peeked out from the rim with not enough room for a presta pump to fit. So I used these extenders to solve the problem. Now I can add sealer. These can be transferred to new tubes if necessary. Perfect solution. ***FOLLOWUP SEPT 10, 2016 *** SUBTRACTING TWO STARS FOR DELICATE CONSTRUCTION I had trouble with one of these extenders and had to order another set. The seal on the end (the white ring in the photo) broke off in one extender. The sealer I added had jammed this end and I could not add air to top off the pressure. I unscrewed the valve core from the outer end of the extender and pushed a wire down the tube to clear the lump of sealer. It held air OK that time. But the second time I topped off the pressure, the same thing happened and it would not take air. This time I unscrewed the entire extender, but the end with the white sealing washer was damaged, probably from the time I had unclogged the tube before. The end with the white washer broke off entirely, so the tube would no longer hold air even when I tried teflon plumber tape to the threads. THE END WITH THE WHITE WASHER SEAL IS EXTREMELY DELICATE AND WILL BREAK EASILY. I had to reorder a second set because once the sealer washer is broken it will NOT hold air. Perhaps it would if you were to glue this section to the original valve stem with something like Gorilla Glue, but then you could not remove the tube when replacing it (the extender is larger diameter than the rim hole). I would much rather these extenders be made from a more durable metal, brass or steel. So I took off two stars for how delicate these are and how vulnerable the essential seal is to breakage. The wall thickness of the sealing end is too thin for the alloy it is made from. Note the sealing washer fits over a reduced diameter tube at this crucial point. Otherwise these work well.

If they leak put some Teflon tape on the threads.

Se adaptan perfectamente a los tubulares continental. No pierden presión con el paso de los días de manera apreciable. Un producto que cumple perfectamente su funcion

RAS

C'est des valves quoi. Rien a dire appart que ça marche.

Prolunga valvola per bici

Typical Continental quality. These are lightweight, easy to fit, and create a perfect airtight seal. I’ve tried cheaper unbranded extenders before that leaked constantly, but these have been faultless. Essential bit of kit for the saddlebag if you're running deeper rims. Fast delivery to the UK as well.