I ducked out earlier for some fuel and oil for the chainsaw. Riding along a road I have been on many times before, same throttle setting, same speed(80 km/h) straight flat road etc, the handlebars decided to do a merry dance! Handlebar probably moved about 20cm each way! Went on for about one second, but felt like 30 seconds! Very high frequency too. The bike didn't get unsettled, but the rider did! I rode like a granny the rest of the way home. That front tyre is outta here! Regards, Andrew.