Lots (all?) of BMWs before mid-90's ish (crown wheel bearings and heavy spline wear), Guzzis (mostly crown wheel bearings I think), early NT700Vs lacked grease on the splines and were often not properly greased up by dealers so those wore out. All Yamahas and Kawasakis seem to be genuinely bulletproof. Having lived with a problematic shaft drive bike (the K100) I really do appreciate the ubiquity of chains and the ease of servicing. If belts were more common then they would be even better, especially if they were enclosed/caged to stop sharp bits getting to them, but they're not. There again it'd be no problem to take a spare belt with you on a trip.. Doesn't replacing a drive belt usually entail removing the swingarm? .. I'm sure I read it somewhere. I once saw a Harley snap his drive belt when taking off from traffic lights! .. That sort of put me off them.