The bike behaves perfectly down to 11 F that I know of. A couple of considerations in cold weather though- let the bike warm up before trying to ride it or it will shift like a cement truck (due to thick oil). I would not use anything thicker than 10W- XX oil, and 5W- XX is not a bad idea either (you can mix them for ~7.5W- XX if you want). The tires will not warm up very well below about 45 F so be aware and careful; when it is 25 F outside that is not the time to try to drag a knee or do a stoppie, at least not on sport-touring tires. Also if the temps. are going to stay pretty low you might want to let a couple of PSI out of the tires because they will not warm up nearly as much as during summertime temperatures (unless extended riding on the highway).
Otherwise, this bike acts as good as anything else on the road in the winter. No other considerations and I have had my C-14 through 3 full winters in New England now.
Brian
I'm ok with my gear and the temps, I just wondered if I should look at anything on the bike.