ok, i got it, i'll go with either 25 or 28mm size. for the 2 posters who were trying to be sarcastic with lipsticks and pigs and asking for which bike this is...this is for my fat bike...I'm going to try to put 25mm tires in place of my 4 inch tires on the fat bike. that will turn heads. i'm sure those tires will beat everyone in the trails, as they make less contact with the rocks.
