好吧，网上找到的：
DON'T set your compressor's regulator to the pressure you desire in the tire
. It will take much longer than necessary to fill because the regulators on
small compressors are usually pretty cheap and pretty iffy on pressure
anyway. If your tire is at 30 PSI, and you set the regulator to 35 PSI, it
can take a long, long time to equalize. Instead, use a good dial gauge and
just fill for a while with your compressor set somewhere around 100 PSI,
then check. Repeat as necessary. After you do this a while, you start to get
an idea for how fast the pressure in the tire is rising. And, should you
happen to overshoot by a few PSI, it's not a big deal (their pressure will
go up once the tires get warm from driving anyway), just let it out--most
gauges I've seen have a little nipple on them for just that purpose.
