Originally Posted by
Steve530
The threaded stems chew up the grommets, so they may not seal well on smooth stems. But if you always use smooth stems, the grommets seal well and do not blow off.
I work at a bike shop and get 2 years out of a floor pump with daily use. My air compressor inflator uses a Silca pump head, which is a slide-on, slide-off fit, and it probably gets 2 years per grommet with nonstop LBS use as well. So while I understand the idea of smooth stems being nicer to pump grommets, I think it's an academic point, considering how much use it takes to actually wear one out.
A 60 mm stem would extend way past those wheels and could cause problems in addition to looking bad.
What sort of problems would you expect it to cause? I do this for a living and it really doesn't cause problems. Aesthetics, I'll grant you that one. But having enough stem to comfortably accomodate a dual-mode floor pump chuck is better than the alternative. Where I work, our next size down is a 48mm and it wouldn't be a good match for that rim, from what I can tell from the photo.