Today I noticed that my front two tires on my quad (2001 trx250ex -Maxxis Razr tires) looked low. I pulled it out today cause I'm suppose to go snow riding tomorrow. I know that the cold weather and not moving the quad can cause the tires to go flat and I was wondering how much psi I should have in them. Should I have more/less than I normally would because of the cold? Thanks!