Despite the fact that these are "ultra light" lamps, there were no problems with flats. They lose some air - maybe 2psi overnight - but as I always check my tire pressure before I ride and usually don't ride for more than 4-5 hours at a time, it's not a problem. I prefer the 52mm valve and rarely find them unthreaded (referred to as "French valves" at retail) so it's nice to find them here.
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