I have found that Stauns and other similar products do not give consistent results, which can be a problem if you 'push the envelope' on how low you go. Being at 11 PSI instead of 13 can be the difference between finishing the trail easily or changing a tire midway. YMMV.Thanks. I have Stauns deflators for airing down but I have a Viair auto-compressor for airing up. One tire at a time is very tiresome (no pun intended).