If you are actually building a real klunker that will be used in the hills and mountains,dont use an internal geared hub.these type of hubs dont have the internal strength to handle the abuse.if you are building something to cruise pavement then they are fine.they also dont shift under load so you cant downshift on a climb unless you coast or stop.the loads and stress will grenade the insides.a true functional klunker should be built to get you there and back no matter what.unless you want to push or carry it off the mountain that is.ive put several hundred hard miles on both of mine since built and never had to walk home.and since im on the subject,there are some nice books and lots of information online about early klunker style builds besides looking at some of the properly built bikes on here.its kind of a specific type of bike.they dont have chainguards,tanks,fenders,baskets or street tires.some bmx cruisers ride the line or are refered to as a klunkers quite often.its kinda like all the people that look at a beautiful traditional style hotrod build or a true 60s kustom car and call it a rat rod.