09-09-2015, 07:05 AM
(09-09-2015, 05:26 AM)Beemer Guy_imp Wrote: My personal, unscientific theory is that the final drives are fine if you are a skinny German guy riding to Austria. But if you are a typical (large) American with a three week supply of clothes in your side bags and tail bag with a 6 liter tank bag and camping gear strapped to the rear seat, all of that weight goes beyond the design specs and the drives go TU.
Me personally, I've never had an issue with the BMW FD units, but then I weigh less than a hummingbird and rarely carry a bunch of stuff, and I've usually flipped the bikes before they got too many miles on them anyway.
Ah, I was going to post something, but I misread your comment. I agree that the shaft drives are probably more fragile than chains, however, they offer some advantages: they're sealed against weather and their maintenance interval is a lot higher. BMW has shaft drive on their K1600 which is a 700+lbs bike with 125+lbs/ft torque. I haven't heard much, if any, on shaft drive failures on that bike.