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A friend had the same model and same issue a few years ago. Being an owner of that model, I am interested in hearing from experienced wrenches' thoughts as what might have caused these incidents.
Could over tightening the bolts be a cause?
Did either bike ever use any type of Never Seize on the threads? I have been told this is a NO NO.
Wheel bolts on the R1100RT are supposed to installed dry - no lube or anti-sieze. They are also supposed to be tightened in two stages. I change my rear tire about three times a year. When I do it, I get the wheel all the way against the final drive, then install the lugs by hand until they are all the way into the wheel. Then I torque all of them to 50 NM, then torque them again to 100 NM (the spec says 105). Never had a wheel lug loosen.
i always mark the bolts with a dot on the outermost point with a sharpie. That ink comes right off with carb cleaner or brake cleaner. I alays clean the bolts so a new mark is needed. When I check air I check the marks. Never had one move.
Rod
One other possible cause would be the spacer ring (between the wheel and hub). If you drop it on the floor and get dirt on it, and then install the ring with dirt on it, it will cause extra space between the wheel and hub. As you drive down the road, the dirt will begin to crush, and you are suddenly left with extra space between the wheel, ring, and hub. Now the bolts are loose and the wheel falls off. I always make sure that my spacer ring is clean when I install it. Same goes for the hub and wheel.