It's time for a new thread on an old topic. I recently purchased a gently used 1989 R100GS. The driveshaft had been replaced at around 60,000 miles (maintenance records were included with the bike). The old driveshaft was provided. I felt the u-joints and they still felt good. I felt of the newer shaft on the bike (rotated the rear wheel with the bike on the centerstand), and felt nothing unusual. Just to be safe, I plan to rebuild the old shaft and change them out, but I'm at a bit of a loss about how best to accomplish this. My preference is to replace the u-joints and simply run the hell out of the rebuilt shaft. I've read several threads on this topic on this site and others, but the most recent was from circa 2006, and am a bit confused about what is currently available. I'm a cheapskate by definition -- I ride airheads, but want to do this thing right. What is the current wisdom on these shafts?