Check the Morotcycle Owner's Manual (ask MOM.) It's the best source of info like this without someone giving you the wrong info. NOW...That being said...can I find an online "MOM" for an Ultra? H-D doesn't have one on their site. They just can't give ANYTHING away can they?
40 front and back
The correct tire pressure for a Harley Davidson FXD is 30 psi for the front tires. The correct tire pressure for the rear tires is 40 psi.
It tells you right on the tires.
38 front 40 rear
Classic Harley Davidson motorcycles first entered the marketplace during the turn of the 20th century. It was the creation of William Harley and Walter Davidson.
36lb for the front tire and 40lb for the back.
36psi front and rear
Harley-Davidson motorcycle company recommends a tire air pressure of 18 pounds for the street glide model. Substitute tires may require a different air pressure.
Acronym Definition FLHRCI Harley-Davidson Road King Classic (fuel-injected)
Recommended psi should be on tire's blackwall.
500
FLSTC Heritage Classic