tire size: ranges from 2.1-2.5

psi: ranges from 28 (sloppy steeps on dual ply sticky rubber) to 36 (railing smooth hardpack on semi-slick)

rider weight: 240

Let's not forget that rim width also factors into the equation. And to all you noobs and hacks who run these outrageously high tire pressures: you don't know what you're missing.