I have had enless problems with these long tall presto valves. They tear the tube where it joins the valve even on the slightest wiggle on the pump. Today was the last straw. I went out to clean the bike and pump up the tyres etc...and ended up with three punctures!!!! twice the bloody valve tore the tube, and the third one was an exploding tube ! I am using a track pump and inflating to 100psi. I have now run out of spare tubes and it's new year, so no chance at the LBS , so I am grounded for a while. Why can't road tyres come with one of those screw on schrader valves that mtbs have? They work a heck of a lot easier. Is there some reason why the dam presto valve exists other than to make my life difficult? I just find the connecting of the valve to the pump so bloody fiddly and cumbersome....I heard I might be able to get tubes with a schrader valve but then I'd need to drill my wheel rims and I'm not about top do that..not after the day i'm having....oh yeah I found out I need new brake blocks as well...looks like more cost...as always... why is this so maddeningly annoying, why are these things never clear?