Originally Posted by
irclean
I pumped them to their recommended max pressure
Maximum pressure is just that--do not exceed. It does not mean "regularly inflate to this pressure" or "this is how much you should use". It means do not exceed.
Optimum pressure is generally much lower and is dependent on tire size and load. See
PSI Rx:
With optimal tire pressure you get both the best performance and most comfort from your bicycle. What is the optimal tire pressure for your bike, both when riding empty and when touring with camping gear? Tire makers print either a maximum pressure or a recommended range on the sidewalls of their tires, but these generalized values provide little guidance about what is right for you and your bike.
I've been using the article's guidelines for a while now. I adjust to my preference from the guidelines, but they're a pretty good start.
I weigh 170 lbs and have 28mm 700C Continental Grand Prix 4-Seasons tires on my commuter. The package states the maximum pressure is 115 PSI, with a recommended pressure of 80 PSI. I run 70 PSI in the rear and 60 PSI in the front.
My other bikes, with the 25mm version of the same tire (package says 120 max, 95 rec) get 80 in the rear and 70 in the front.
Perhaps that guy who works for Schwalbe will chime in here too.