Question: How to check your bicycle tire pressure by hand
Option 0: In general you should fill your tires to the maximum allowed pressure at all times so as to ensure proper performance out on the trail. This way you will never have to worry about running too low of a pressure.
Option 1: While you won't get an accurate reading you can approximately gauge proper tire pressure by pressing agains the top, on the tread, towards the rim. Squeezing the sides is not indicative of actual tire pressure.
Answer: 1