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.
Cause of Tinnitus: Muscle Spasms. Hi @VaR - I'm sorry to hear about your whooshing sounds. For what it's worth, you and I both seem to suffer from very similar sinus/Eustachian tube issues, and when I bend my head over, I, too, hear a slight quiver in my ear that comes and goes pretty quickly.