The ball joint should be replaced if the boot gets torn or any high mileage bike. If you are installing the Wunderlich WRA Lower clamp on your R1200 GS or Adventure, then we also suggest that you install a new ball joint if your bike has more than 30,000 miles.
The ball joint includes a new nut, which should never be re-used!
Original BMW part number: 31 42 7 652 644 and 31 42 2 330 996 (31427652644, 31422330996)
Fits both top and bottom fork clamps on the following models: