Was washing my bike when I noticed a crack on one of the ribs that the rear brake disc is bolted to. Hmmm, what could have caused that? 6 months later and cracks on two more of the stuff, I never got round to ordering a replacement. Time to change rear brake pads in July and its more ugly than I thought, ok, I'll park up the bike while waiting for a replacement but I had to do one last 400km (to/fro) business trip next day and it was a GS type trip. 120km into the trip, I slowed down for a police checkpoint and wham I hit a log on the road I did not see so pulled over. It was not really a log but the rear disc coming out from from its mounting. Not good Pulled over.