Mostly for fit. My proportions are so unusual that my other custom bikes have a 60 cm seat tube and a 56 cm top tube. My inseam is 34 and my sleeve length only 32. (I don't look freaky, really.) I also do not have great lower back flexibility. I had a Retul fit that confirmed that an off-the-rack bike may be hard to find. That said, a Colnago CX-Zero, its top of the line "endurance bike," has a very tall stack and a short reach that may serve me well.

The problem is, of course, LBS don't stock high end bike like the Colnago, so I have to buy it before trying it. Yet, I'm leaning toward the Colnago because the LBS has said that if I don't like it, he's willing to take it back because the size is one he can sell. In that case I'd go for the Seven, which does have a guarantee that if I don't like it, they'd build me another one until I was happy. I's impossible to try a custom frame beforehand, of course, but with that kind of guarantee, I feel pretty confident I'd be happy. The Seven bike is here: Seven Cycles | 622 SLX