Originally Posted by 72andsunny

I’ve had bikes with Presta valves for at least 30 years. In the last year, two bikes (one new, one just with new tubes), started getting flats, sometimes slow, sometimes fast. I was never able to find any holes. After a few wasted tubes, I figured out I was loosening (or completely removing) the valve while opening or taking off the cap. I didn’t even know this was possible. Have Presta valves always been removable or is this a new thing? Why would I want to replace a Presta valve? Anyway, I’m loctiting them when I think about it. I’ll let you know how that goes.