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I bought these to use with my track wheels. The material at the base of the extender is so thin that it easily "unwinds" and pulls apart. Junk.
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I purchased a set of these extenders in January 2013 after obtaining a set of carbon deep dish wheels.I use Lezyne road drive & floor drive pumps, and I really like the threaded chuck on those pumps; it means I never have to worry about the pump coming loose during inflation, or needing to hold the chuck in place with one hand. Much easier.
These are well-machined and come with a bag of replacement o-rings to ensure a solid seal with your presta valve.
As for Lezyne customer service, about a week ago I had a puncture, my first with the carbon wheels. Upon attempting to take the tube off, I found that the bottom of the extender had become corroded and it basically fell apart as I took it off. The other extender from the front wheel was just fine, so I used that to pump up the replacement tube and finish my ride.
I emailed a picture to Lezyne (I've uploaded the same picture here to Amazon) and they sent me a full replacement set of valve extenders in just 3 days, free of charge; excellent warranty coverage.
Given that only one extender corroded, I'm inclined to believe that I rode through some type of chemical which ate away the aluminum in that area. Who knows what the heck is on the roads these days. It is definitely not a manufacturing defect.
I'm very satisfied with the product and with the service I received. I'll continue using these on my Zipps in the future.
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