The reason for the different torque figures in the BMW models is there are two different retention systems F Series has a 32mm Nut (M20x1.5 thread) and a locking washer. - 140nm torque G Series has an M10x35 bolt (17mm Socket) and locking ring. - 40nm torque The Terra is the same as the G650GS retention system (10x35mm bolt) so 40nm is the correct torque