When we were kids on the farm we beat the crap outa bikes,used em like 4 wheelers.Your going to be alot gentler than that im sure.I take my 700x35 hybrid on some pretty crappy stuff.I just watch where i'm goin as i'm runnin smoothies,but thats all we had as kids.No such thing as mountain bikes back then.Of course new bikes aren't as heavy built either i suppose.Just pick your way around stuff,it builds a good sense of balance going slow for old guy like myself anyway.Would'nt probably do it unless i had minimum 32 spokes on a decent rim though.