Aluminum frames are EXTREMELY difficult to work with. (We are talking about tube frames here...NOT monocoque structures.) The weight savings is worse than minimal at best. The Porsche 917's went to EXTREMES to save weight. They finally resorted to welding a bicycle valve into the tubes to detect cracks because they were so terrible for fatigue cracking. If the frame didn't hold air, it was cracked.
BE VERY CAREFUL.
David
