You can buy a premaid nexus wheel from Harris Cyclery and then add to most any old steel frame road bike. Spreading the rear stays is not difficult. I did the conversion with a 1973 Schwinn World Voyageur. I got my hub on ebay w/ shifter and two cogs for $151.00. I had a local shop build into a Sun CR 18 36 hole rim. Here are some pic. If you want to do this and have questions let me know. I love the bike and it is a fantastic commuter. I have been riding all winter w/ Studded Nokians. Looking at this pic I realize I need to wash it!