Ok, so I am new to biking and don't know squat, as you will soon see. I bought a brand new E-bike, an Ancheer 500W. I borrowed an air pump, but had no pressure gauge when I first aired up the tires... they felt firm when I pressed them, but when I sat on the bike, I could see the tires going down.
So I ordered a new air pump with a pressure gauge, and when I checked the tires they only registered about 17lbs. each. The recommended pressure on the tire sidewall is 40/65 PSI, but when I got to 35lbs the tires were rock solid and I was afraid they would burst If I kept going (I'm probably an idiot).
I took it for a ride, and it the ride was great, screaming down the road. I came home, put it away... then a few hours later I check it and the rear tire is completely flat! I checked for nails or screws but found nothing. So I aired it up again, to 35 lbs. and then listened for a leak. I heard nothing. It seems like its perfectly fine again.
After all that my question is this: Would the fact that I only went to 35lbs of pressure be the reason it went flat after my ride? If so, I don't get it, because my first ride was half that pressure and it never went flat.
Also, if the tire feels rock solid when I touch it at 35 lbs. is it still safe to keep putting air up to the middle of that recommended range? Is it possible it could pop right in my face?