I'm about to start a full service on my '88 K75S.
I have a pair of Bridgestone - Battlax BT45V Sport Touring Tires on order. The Metzeler Lasertecs that came on it are both 5 & 1/2 years old.
I also want to replace the valve stems. What size valve stems should I buy for this 1988 model bike that was built in July 1987?