Hey all, I had some rear wheel vibration trouble with my 2010 Honda CB400 on Tuesday night at the South Yarra Boulevard. Near the end of a run, I was travelling at about 60 in a straight line (I had just slowed down) and the rear of the bike started vibrating violently for about 30 seconds. It felt like a flat tire, so I slowed down to find a safe place to stop on the left but the vibrations stopped and the bike came right. The guy behind me at the time said he even saw the rear vibrating as he followed. I have checked the wheels, suspension, chain and brake (no abs system - so its not that) with some other riders but we didn't notice anything loose, damaged or odd. I kept riding the bike for a few hours, testing the rear brake at different speeds etc and it didn't occur again. The chain was only cleaned and relubed on Sunday. The bike has only done 4000km and has never been in an accident (Well... I did scrape the exhaust on a wooden pole once ). Everything is stock, nothing has been replaced. Does anyone have an idea of what could have caused this vibration? Could the chain shift on the sprocket if I had lubed it up too much or if the chain is too loose? I'm pretty new to this and annoyed that I can't replicate the vibrations and find the cause. There would be nothing worse than this occurring again but at 80 clicks mid way through a corner. Any suggestions would be greatly appreciated.