Worthwhile post-ride check - is your rear brake hotter than hell?
Near the end of a 300 mile trip with temps near 100F, I noticed increased driveline lash when traffic turned to stop-and-go. It felt like the chain was loose.
When I finally got to my destination, I went to lube my chain and noticed a "clunk" noise as the wheel turned - my brand new (<2,000 mile) cush drive rubber was not holding the hub securely. Sure enough, the brake was dragging. Not enough to be noticeable in motion, but enough to heat the hub and bake the rubber. What a waste, I should have known better.
I think my rear brake pin is worn beyond use so I'll replace it, but I also plan to heat check my rear brake disk at gas stops in the future for the peace of mind, and grease the pin far more often than before.