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)
Most tinnitus is due to damage to the cochlea, or inner ear. Certain medications can cause or worsen tinnitus, for example, aspirin, particularly in large doses. People with tinnitus may be over-sensitive to loud noise. Most people learn to live with tinnitus, but help is available for those who find this difficult.