Originally Posted by
Sy Reene
Agree so I get the michelins. That said, I bought a tube once but can't recall the brand, and it seems an obvious solution, and not sure why it isn't more universal, but why don't even the threaded valve makers just put the thread only at eg. the bottom 1cm of the valve and leave the rest smooth?
This is not possible, unless the threads at the lower end are made larger in diameter, so the nut would slide over the unthreaded portion. Then the threaded portion wouldn't fit through the small hole in the rim. The smooth and threaded versions are both about the same diameter, so they fit the rim and presta inflators.