I'm about to do a Tire change on my 2015 drz400sm. My front tire was washing out on me so I decided it was time for new tires. I then went to a car mechanic just to ask them to check my front tire pressure. They told me it was at 6psi, that's when I realized that I had tubes on my bike. If the tire pressure on the new tires say 20psi max ( I plan on running 22 in the front and 26 in the rear) but the tube is only set at 6 psi how do I know what to set everything at after I get the new rubber on?