A designer on Etsy by the name of PixelThis has created a recycled bike wheel clock. This unique timepiece is a "high torque German quartz movement" that runs on one AA battery. The clock is mounted to the wall through a hub that gives it the illusion of floating. Since the clock is made from recycled wheels, there may be a few scratches -- but it adds to the rugged, rustic style of the piece.
The recycled bike wheel clock is available on Etsy.