So I'm building a bike from the parts bin to ride with the family. Flatbar, roadframe, 10 speed rear with flatbar shifter, single front crankset, etc.

Plan on using a Shimano Alfine single-speed crankset with a 11-28 rear cassette with Ultegra derailleur. Now, Shimano makes two different Alfine cranksets:

-One with a single chainguard and chainline of 42.7mm
-One with a double chainguard and chainline of 49.2mm

(http://bike.shimano.com/media/techdo...9830604038.pdf)

I'm assuming the double chainguard would be best for a 1x10 setup so to keep the chain on the crank. However, would the single with the lower chainline be just as good?

I don't want a dropped chain, but I also have all the parts to make this work (outside of the front crankset) so I'd really like to make this happen with just having to spend the money for the crank (the proper one, of course).