My rear bearing went at 18k the bike started to wobble and it felt like I had a flat or soft back tire, I was on a 200 mile ride at the time, I checked every thing and could not find anything while I was on the road, pumped the tires and it seemed to go away, Stopped at the Dealer on the way home and as I was reversing the bike out it felt like my brake had siezed. I battled to push the bike backwards, there was a loud crack and the bike rolled freely. Took it into the workshop and put it on the lift, The rear left bearing had collapsed. Replaced all wheel bearings, the bearings that were in the bike came from India, I bought my own High Quality bearings and the dealer fitted them for me. Have had no problems since.