A melange of parts, starting with a steel mtb frame. I did build a set of nice wheels, Nokian Extremes on, phil hubs-7spd freewheel, and Sun Ryno Lite rims for the 27mm width, flatten out the tire a bit. The widest tire this frame can accomodate is 2.1" width. Good for most city use. The hitch is for a bike at work A64 trailer, I haven't used it in the winter...yet :-) I have a Son28 dyno hub on my LHT that I really like. I think one would be good for a bike such as this also.