I was following a maverick down a steep hill this afternoon, he was in the far right lane and I was in the middle lane. As we approached 80klm/hr I noticed his front wheels start to wobble and then they both reached what I can guess is some perfect out of balance condition and the whole front end was almost bouncing off the road. Poor guy was hanging on for dear life and this thing was wobbling and moving around about a mete. I put my hazard lights on as the traffic behind probably couldn't see what was going on. I thought the whole front end was about to fall out. Then, it simply stopped as he slowed a bit and he carried on, and when he reached 80 again it didn't happen on the flat. Any ideas? Guys looked pretty rattled, pass side wheel nuts looked fine. Tyres were some sort of no name brand, road tread, but rears were fine.