Trail numbers refer to front end geometry. You may have a faulty tire pressure gauge and are actually on the low side of the recommended PSI. I would however plan on new tires soon. After 5 years the rubber is harder and slippery even on the best surfaces. Be really careful during a rainy day.
A hint for better tire mileage is to run with 2-up pressures all the time. The handling will not suffer and there is slightly less rolling resistance from the rear tire.
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