When I bought my current bike I talked to the LBS owner about a wheel upgrade from the stock Ksyrium Elite wheels. Of the upgrades in his inventory he had the AC 420, but then surprisingly told me that he would not use those wheels because of the same reason Peter stated. I am glad he was honest to tell me rather than sell me his unwanted inventory.gtop46 said:What do you thing about the american classic 420 wheelset ? Can you also give me a good link for this wheelset ? I have find the planet x pro carbon 50 for 700 $. Does anyone know about this wheels ?