I am thinking about putting some 2.5 on my caffeine frame but I have found no information about the max tire size for my frame. The frame is an XL by the way. I know i got room in my Fatty but what about the rear, is there any way to measure, other than a vernier caliper, to make sure it will fit? Oh yeah can you guys throw in some info about max rotor size or will all fit my rig?