For people with hearing loss, the sound signals from the inner ear to the brain will be weaker than normal, and it's possible that the brain amplifies these signals too much to compensate, resulting in hypersensitivity. However, this doesn't explain the cause in those with hyperacusis and no hearing loss.
Bicycle Valve Stem Types. There are three types of bicycle valve stems in use: Schrader, Presta and Woods/Dunlop. The Woods or Dunlop valve stem style is much more rare than the other two. Any wheel rim that fits a Schrader valve can also fit a Woods or Presta valve.
Once the tire is at the correct pressure, the pump valve is removed from the tire, and the cap can be replaced on the tire valve. There are two types of tire valves to which the bicycle tire pump attaches. These are the Presta valve and the Schrader valve, with the Presta valve being the most popular.