Ideas on what would cause "spontaneous" chain tigh
My chain had perfect slack when I left for my killer SE Ohio ride yesterday morning. I could just touch the bottom of the swingarm with the chain, which is just how I like it. Adjustment nuts (lock nuts) were snug and the axle bolt was torqued properly. The chain had the same amount of slack throughout it's entire run.
Somewhere in the first 200 miles the chain got so tight that when I rechecked it in Marietta it had maybe 2mm of slack. I could barely move it. All the bolts were in the same position and the chain had the same amount of lack of slack throughout it's entire run. I readjusted the chain.
The riding was about 70% street, 30% gravel or dirt roads. The only "off road portion" was a small boulder I rode on and then jumped over twice, a half dozen curbs, and a small hill climb that actually was too techinical for me; the front wheel kept getting air and pitching me off the back. Three tries at that and I gave it up. I don't really know if the riding style would have some effect on the chain tightening but thought I'd submit all the information I had.
After I got home, 400 miles later, the chain had not moved from it's re-adjusted position. What gives?