I'm thinking of ordering a Specialized Tricross. I'm uncertain though, as to sizing. I've been riding 17-inch mountain bike frames from Specialized, and those fit me well. But the Tricross is more of a road-bike, and those seem to be sized completely differently from mountain bikes. I am 5' 8" tall, have 31.5" measured inseam (32, maybe, if I push up on the book really hard), and my current mountain bike is a 17 inch frame with a 591mm effective, horizonal top-tube. What size Tricross should I be looking at?
(Unfortunately, I have no opportunity to try a Tricross in person. That's why I'm throwing this question out to the forums. I'm thinking of taking a chance on one of the closeouts from Bicycle Warehouse.)