About two weeks ago, I noticed my drive belt was pretty sloppy. Bought the fancy 36mm axle wrench and pressure gauge off Amazon for a pretty good deal. Manual says to check it at the loosest point which I did. Adjusted it to 1/2" free play with 10 lbs of pressure on the belt. Rotated the back tire so the belt spun about 90*. Checked it again at this point and it's real tight. Spun it back to original location and still have 1/2" free play. Why such a big difference in free play depending on where the belt is??? I don't want it super tight, but specs call for between 3/8" - 9/16" free play at the loosest point, which is where I have it. Just can't believe there's such a big difference in the free play from point A to point B. Maybe the sprocket is not a perfect circle??? Rode 150 miles and re-checked. Same thing. 1/2" free play at the loosest. No free play at the tightest.