I used my old Trek mountain bike last winter (Helsinki, down to -25C, lots of snow) for commuting to work (8km each way, roads) but it probably needs too many repairs to be worthwhile.
I got a new sports hybrid thingy (Crescent Zetta) in the summer, and it might be ok for winter use with some studded tyres. It has disc brakes and 32-622 tyres. I don't know the size of the rims.
I have 26" Nokian Hakkapeliitta W106 studded tyres for the mountain bike, which were very good last winter. These obviously won't fit on the Crescent's bigger 28" wheels, but the W106 also comes in 37-622 (700x35c).
Would 37-622 tyres fit in place of 32-622 tyres or is it too big a difference?