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Just put a set on my 04 GSA. The sidewall says max psi 41 on ft and rear. I ride two up. Do you go by the book or the tire on air pressure setting.
The book is a good source but given the fact tires are constructed differently and use a variety of different compounds depending on tire brand and tire model I would pay more attention to the tire. Tire pressure is not a cast in stone number so you need to look at your primary riding habits and season to taste. Different model street tires can and do have different recommended tire pressures. The vehicle manufacturer can not allow for all the variables involved so therefore they have a recommended pressure for the OEM tire primarily. You will probably not see large variances when comparing OEM to 3rd party tires.