When it comes to bike, you usually get what you pay for. Stealth bikes are very popular among those who need a ride that does not make a whole lot of noise. The BMC UC01 City Stealth Bike is such a bike. The bike has a carbon belt drive that makes it quite silent. The belt drive does not need a whole lot of maintenance either ( repels water, dirt and mud). No oil is required. The bike will cost you $2000 or so.