I’m also prepared for ice and snow and like -15°C (+5°F)

I'm planning to ride this very bike for my 9'th Festive 500, in a row, here in Sweden. Studded tires, fenders, and mudguards are mandatory. Fixed gear isn't an option for most riders. For me, fixed gear is, indeed my weapon of choice this year as well. No gears to get frozen. No cables to get frozen. No brakes to get unusable.