I have a Cannondale CAAD9 that I bought at the beginning of this summer. It is a great bike and I treat it like my baby! The only problem I have is that I am losing significant air in my tires. I have already replaced the tubes twice, and I am sure these do not have any leaks or tears, but they are doing the same thing as the first set.
I ride about every 4-5 days, and everytime I want to go ride I notice that the tires lose about 40-50 PSI just from sitting there.
To make sure it wasn't from the previous ride, I measured the air pressure at the beginning and at the end of a typical ride, and I had only lost 2 PSI. Is it normal to lose this much pressure between rides? What could be wrong?