Re: Aluminum Frame or Steel Frame?
Chromoly for sure. I built a mountain bike and the tube diameters fit the stock engine mounts perfectly without using special clamps. Also it is stronger. One of the best advantages is it absorbs vibrations much more than aluminum. When I ride my non motorized mountain bike in the mountains aluminum is the best. My single speed mountain bike weighs just under 20 lbs which is great when climbing 3000 ft in one ride with my legs as the power source. I don't think the extra weight makes any noticable diference with a motorized bike.