Originally Posted by
zacster
My compressor goes over 100psi, but I don't use it to inflate my tires, I don't have a chuck. But you do need to inflate the tires before every ride to the rated pressure, or at least 120 if they are rated higher. I ride in NYC on Conti GP4000s and I don't get flats.
Low pressure is typically only an invitation to snake bites. Hard telling if that's what the OP is experiencing. OP, if it almost feels like you're hitting your rim on bumps, this may be the case. Optimal PSI will be dependent on tire width and rider weight. I weigh 145 and like 100 front, 110 rear in my 25s usually, but I only air up every couple or 3 days.