single speed bikes are crazy long wearing! years ago, I had a new Bianchi DISS, and right out of my buddy's shop, I decided I wanted to do as little maintenance as possible to this bike. I rode it from November thru March with only adjusting the chain and rotating the tyres. this is on a single speed MTB with disc brakes. I don't own a car. That was my sole source of transpo/recreation/sport. I'm sure it had at least 4,000miles on it with zero cost in maintenance.