Introducing the Brake Clock. It's a clock for car and bikes enthusiasts. Diameter of the rotor is 225mm.

You can mount it on the wall or on the desk using the provided stand.

If hanging the clock on the wall, you will need to make a hole on the back of the rotor according to the mounting system you are using.

For assembly: you will need 12 M4x18mm or M4X20mm bolts, 2 small wood screws to hold the caliper onto the rotor. Tapping the threads IS RECOMMENDED. 

For optimal surface quality, I do not recommend using “ironing” function.

The clock mechanism is linked below from bambustore, or you can adopt alternatives, the size is standard.