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.
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: