IMO you can't go wrong with the 14's. I find the casing stiffer and more stable than the powers and for street riding you'll like the more round profile of the 14 over the pointed race profile of the power. I've found the 14 hard to beat for a good all around tire. Sticks just as good as the powers with much better feel.Isn't PSI based on the load/weight? I'm torn between BT14's and powers.
My son's race partner took his new gixxer 1K to the track right out of the box with the stock suspension and stock 14's. He run 36's at Seattle's Pacific Raceways pretty consistantly. I challenge anyone to take a bone stock bike without even setting the suspension and run a better time on powers?
Load/Weight ratio is the controling factors for touring tires. For performance tires, psi is set to generate the proper amount of heat to achieve maximum grip.