I recently bought a Yamaha FZ25, used. It is generally in great nick, having only run 13k kms in 5 years. The tyres were shot from sitting too long, so I got some new ones.

It’s been great, but I have noticed significant vibration from the rear all the way to the brake pedal, only when I have a pillion on board. The new tyres are pretty knobby, but I don’t feel any vibration riding solo. Could this be a wheel bearing issue?