The proper pressure for you vehicle's tires will be listed on the label on the driver side door jamb.
The air pressure for many tires is 32 pounds. The sidewall of the tire will be stamped with the correct pressure for the tire.
The correct air pressure for your 2003 Road King standard tire is 18 pounds. The tire air pressure is dependent upon the type of tire.
It means that you need to check the air in your tires.
32 psi
My 2003 4 runner is recommended for 32psi. Check the drivers door jam. On it you will most likely find a sticker telling you the correct tire pressure.
30 to 35 psi
turn the parking lights on and off 3 times
read the pressure on the side wall of the tire...........".moremud"
Front/Rear 30/35
Look at the specs decal on your drivers side door, usually 30 to 32 PSI.
My 2003 4 runner is recommended for 32psi. Check the drivers door jam. On it you will most likely find a sticker telling you the correct tire pressure.
Listed in your owner's manual and on the driver's door post, or trunk, or console lid, or glove box.