Пишут, что шум не только от подшипников.
Вот один из вариантов устранения шума: https://waywardcyclist.wordpress.com...enius-trainer/
Ещё нарыл:
Next the black cap can be prised off the flywheel with a small screwdriver, exposing the 13mm retaining nut underneath.
Note: there is not enough exposed thread to make it obvious, but this is a left-handed thread. Fortunately, I had found this out via Google already – else I may have been stuck at this stage for some time The flywheel body needs to be securely held with a strap wrench, or in a large vice, while the nut is turned in a clockwise direction to loosen and remove it (the opposite direction to a standard thread).