My ultra handled much better when I switched to Max PSI that is on the tire from the HD guidelines. So 42 rear/41 front in my case.
Probably getting better life out of the tire as well.
Next question, compare your tire gauge with two or three others - they vary and sometimes a lot.
With any aftermarket tire brand you want to go off the psi on the side of teh tire as opposed to what it says for teh factory tires. Max psi on different brand tires is different. The manual is for the stock tires only.
With any aftermarket tire brand you want to go off the psi on the side of teh tire as opposed to what it says for teh factory tires. Max psi on different brand tires is different. The manual is for the stock tires only.