Depends on what tire, how many ply, how stiff the sidewall and so on. I with a 6 ply tire i usually run about 12 PSI. With an 8 ply tire i usually drop down to 10. I am not a fan of 4 ply tires but up around 14-15 psi usually will keep you from getting a pinch flat. 2 ply (what comes stock on the CF Moto should really only be used for sand. When I run in the sand i go down to 2 psi but there is nothing to pinch them on.