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)
1 Problems with the temporomandibular joint, the joint on each side of your head in front of your ears, where your lower jawbone meets your skull, can cause tinnitus.  Head injuries or neck injuries. Head or neck trauma can affect the inner ear, hearing nerves or brain function linked to hearing.