Joined: Feb 2012
Posts: 19,381
Likes: 5,528
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Low volume tires will have more air loss with each pressure check. With only a little practice you can figure out about how much pressure level loss is typical for each pressure gage use.
I use Zefal gages, both the twin head and the older single (and either presta or Schrader) valve specific ones. Either one when used well result in a few PSI loss with each use. So if you want 90PSI pump to about 95PSI and check. Recheck until the gage reads about 93PSI. Stop checking and go for a ride.
Tire pressures aren't rocket science and for high pressure/narrow tires a few more or less wont be the cause of any problems. Your riding skills to avoid crap and how to work the bike over/through tricky sections will be the issue. Andy