I think I might try out a 7spd w/ the mega range 34T for my Elance and a 7spd 13-28 for my 610. I am currently using an 11-28 cassette on an Exage hub but, I really like having matching hubs especially when they are as smooth as mine currently are. The Elance is a long cage D/R and the 610 is a short cage so I shouldn't have any issues hopefully. Any reason NOT to go 7spd F/W?