Here's a hook for hanging up your bike. It is approximately 11mm in diameter, rubber coated and has a 5cm long wood screw at its base. We set our garage up with hooks about 4 years ago and they are still going strong.
22cm total length (top of rubber to base of metal thread)
10.5cm external width (from outside of rubber to outside of rubber)
Thread: O.D. is 11mm, I.D. is 9mm
It will need to be screwed into an appropriate piece of wood or stud, do not use hollow walls! Pre-drill a 9mm-10mm hole into your wood and then screw this hook in. It also comes with a nylon plug, in case you want to use a solid wall.