I like all the different kinds of bikes people use for gravel grinding. I also like the way this brings cycling back to where it started. Cyclists pushed for good roads and now that cars have taken those over, cyclists get to enjoy the bad roads again.
I've used different bikes for fire roads but I'm getting ready to rebuild my 1993 Bridgestone XO-2 as a gravel grinder. It was more or less designed to be a gravel grinder even though no one used that word in 1993. It is a very sure footed bike though with road geometry, cantis, and 26 inch wheels. I have't quite decided on the final build but I'm leaning towards a lighter wheel set (I'm running a sun rhyno lite up front but it's pretty heavy), STIs or maybe the retroshifts, and probably a triple crank:
