Just reading the pressure with a stand alone pressure gauge will cause a loss of pressure. On a car or truck tire the loss is negligible but I don't think its worth the hassle on a bike tire. Just like nearly every other post in this thread I support the purchase of a floor standing pump with gauge for 90% of your tire inflation duties. The mini-pump will more than earn its keep filling your tire after you have replaced a tube or patched one, on the road. With a mini-pump, gauging tire pressure is easy: pump until your forearm muscles scream for mercy, put an additional 10 strokes in and call it good.


H