So many variables that guidelines are just that, similar to trying to get the right size bike from the sizing guidelines from the mfrs. Just don't run your tires at max pressure listed on the sidewall. Maybe start 10-15 lbs. less than max and go down from there until you find the best pressure for your tires, your weight, and road surfaces on which you ride. Of course, don't go so low that you risk pinch flats. And your rear tire carries most of the weight, so it can be a bit higher psi than the front. Experiment, you'll find what is best for you.