Thanks for the advice on the 48 wheels. We order a new rim from precision Tandems. This weekend the problem was the chain. We were running an almost new Dura Ace 10 sp chain and it bended on us for no apparent reason.... other than a 12% hill that we hamered... but with no shifting under pressure or chain crossover. Is there a sturdier chain that we should be using on the drive side of the triple?