joe garski
New member
I'm installing new tires on my 1977 R100S. I've changed many tires over the years, but one thing has been bugging me. I'm using new Metzeler inner tubes. The valve stem has two jam nuts and a conical shaped washer on it. I know the washer goes between the tube and the rim, but does one of the jam nuts go inside the rim between the washer and rim? Or does ONLY the washer go inside the rim and BOTH of the nuts go outside the rim? It seems if I put one nut inside the rim the tube would have to distort to form around the nut. The rubber is very thick at the valve stem, and the nut would put undo stress on that part of the tube. Any thoughts?? Joe