My daily beater here in Stockholm is a fixed gear bike with a common chain, clean the chain and slap some all-weather chain oil on it every 3-6 months and it's

My daily beater here in Stockholm is a fixed gear bike with a common chain, clean the chain and slap some all-weather chain oil on it every 3-6 months and it's good to go. During mid-fall/winters I swap to my wheels with gravel tyres for better traction. There's no need to go for a belt-drive just for weatherproofing sake, a good chain oil is enough to keep your chain going pretty well. I bike around 8-10k km per year on this bike for the past 7-8 years, mostly just doing the basics of maintenance: change brake cables and tubing, change brake pads, clean and oil the chain. The only times I needed to do more than that was after forgetting the bike outside when a snowstorm came, that can fuck you up: tyres cracking, chain rusting quickly, don't recommend it.