On a small number of motorcycles, the cardan shaft (shaft drive) may not have been manufactured properly. As a result, the connection between the shaft and universal joint could slip. If this happens, there could be a loss of power to the rear wheel.
A loss of power to the rear wheel could increase the risk of a crash.
BMW Motorrad will notify owners by mail and advise you to take your motorcycle to a dealership to replace the cardan shaft.