Originally Posted by
Piratebike
I put the max in mine becasue by tomorrow it will be less. I don't know about you guys but my tires never hold air for long on ANY of my bikes.
That's normal, all tires do that, even your car tires do that but as they hold a lot more air at much lower pressure it take a while to notice on a car tire. The oxygene molecules go thru the rubber slowly, that's why some will put nitrogen instead of regular air because the nitrogen molecule is bigger so the process is slower making the pressure more stable. There's a name for that but I don't remember what it is.
Here's a better explanation:
http://www.popularmechanics.com/cars...stions/4302788