Frame is a standard (road) 68mm English BB, 130mm rear dropout. Since the Alfine crankset is offered in a 39T and 45T and I know my cassette (11-28), I suppose I should choose the crankset that'll put me in the middle of the cassette for most of my riding. Still, I'm torn on the double chainguard vs single chainguard. As for the 1x10 setup, many OEMs are doing 1x9 setups (with mountain components). Is there something inherently better about a single crank with a mountain cassette/mountain rear derailleur?