Hey, lately I've been dirt jumping, nothing big, just a 2 or 3 ft high launch ramp made out of dirt. Well, my friend always tells me to let air out of my tires because it controls better and jumps smoother on dirt. Is it ok to lower the tire pressure? My tires say 45 min. and 65max. , so should I not go any lower than 45 psi. ? It does seem to make a HUGE difference though, because ever since I lowered mine a little, it has been soooo smooth. I was just checking. Oh, also, when I switch over to more concrete and street riding stuff, should I make sure that my tires have more pressure in them, or does it not really matter? Thanks!