I've been thinking about buying a pair of wheels for an ironman, and was looking on ebay at a wheelset zipp 440 front, and zipp 3000 tri-spoke rear. Does anyone have any advice. I tried searching on the internet for the zipp 3000 but can't find anything. Also the rear wheel is only 7 gears does anyone know if it can be upgraded. The wheelset is "in good shape" does anyone have an idea about how much it should cost. Thanks any adivice is appreciated.