i would think that a fat, wide, "cruiser" tire of 26x2.125 would provide the most cushion and stability, counteracting wobble to a degree, if nearly negligible. i would assume this because cruiser motorcycles are similarly equipped. can i get some experienced guys to comment? i'm asking because i was going downhill on my new frame/suspension setup and there was some wobble (or the beginnings of wobble) on my 10 year old mountain bike tires. this could be from improper installation of the suspension (improbable) or the tire itself, or an unbalanced wheel.