When I accidentally damaged one of my new Hunt carbon bike wheels I had the rim replaced on insurance. Now I had a structurally damaged but visually immaculate carbon rim that needed a new purpose, so the carbon aero clock was born.
The original wheel had 20 spokes which I thought might make reading the time consfusing, so I opted for an 8 spoke design chopping the face into quarter-hour segments. I also added some rings from a rear cassette for extra bike-ness.
I’m really pleased with the minimalist design:

The central hub is 3D printed, mounts the clock mechanism and gears, and includes 8 spoke holes required to mount it into the rim.
Enhanced aerodynamics and wind-tunnel testing don’t seem to make time go any faster, though.