renton20

So I'm building up a surly 1x1 to use as my winter commuter/trail rider and was thinking of setting it up with an IGH. I rode a single speed last year and wasn't disappointed but I think that throwing some gears on it would make this bike a little more versatile. I was looking into the nuvinci 360 but they say not to use it below 45 degrees fahrenheit. I live in MN and cycle year round, I did a race on last new years eve when it was -15 before windchill outside.

I'm mainly looking into the alfine or the i-motion 9. Does anyone have any experience with these hubs in the winter? My theory was that they would keep water out better and therefore not freeze up like I've had derailers do to me.