With switching wheels the weight loss is felt in a couple different ways: Overall weight On a bike that only weighs, let's say, 28 lbs (12,700g) a loss of .9 lbs (410g) is about 3% savings.
A single exposure to a sudden extremely loud noise can also cause tinnitus. A variety of other conditions and illnesses can lead to tinnitus, including: Blockages of the ear due to a buildup of wax, an ear infection, or rarely, a benign tumor of the nerve that allows us to hear (auditory nerve)
Drugs that cause tinnitus may be prescription or over-the-counter medications. Some of them cause actual damage to the ear, resulting in permanent hearing loss and/or tinnitus, but this condition is much less common than temporary tinnitus that will go away. Some of the medications that can cause tinnitus will surprise you: