Fixed gear bicycles are very attractive to novice riders because of their simplicity, but I cannot imagine an Athena getting a good enough workout on one to achieve any significant weight loss. Gears are a very necessary evil when you don't have the legs of a Category 4 road racer which makes living with a 76" gear 24/7 a possibility. Not knowing anything more, I would risk putting 90psi in those tires but I don't think it is necessary. 80psi is probably a good target. A 32c (is it really?) 'should' be able to take more than 70psi so this is an indication of tire quality. On the other hand, recentish trends are to lower pressures overall. The tire labeling may be a nod to the reluctance of Rene Herse disciples to willingly put more than 40psi in a tire.