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.
Sinus infection or lesions can lead to headaches with tinnitus. Sinus related conditions leading to inflammation of the mucus membrane can also manifest typical ringing sounds in the ear or the head. These sinus conditions can bring on a generalized headache and sounds in the ear, sometimes followed by fever as well.
Hearing loss may have many different causes; but among tinnitus subjects, the major cause is cochlear damage. Ototoxic drugs (such as aspirin) can also cause subjective tinnitus, as they may cause hearing loss, or increase the damage done by exposure to loud noise. Those damages can occur even at doses that are not considered ototoxic. Tinnitus is also a classical side effect of quinidine, a Class IA anti-arrhythmic.