happened on my RG 500 one time and worse during a 12 hours endurance race on which we have only 10 minutes by driver to do a time to be qualified (Bol d'argent 1981, Monthlery track) we were the only H2 among Honda CB 1100R, Suzuki GS 1000 S, Kawasaki 1100 GPZ. We have plenty of wheels with the tyre on and we choose what we thought would be the best time for a few laps to get the qualification, Did a first lap quietly then the second fast excepted rear wheel was really swinging, back to the stand, put the bike on the race stand, put the rear wheel with my hand can shake it: wheel bearing out, no time to change as was production race with standart fit up and we have just 5 minutes before the end of my qualification, so DNQ DNS