So, I got out the digital calipers last night, and found that 6 full links (that should be 6.00") were 6.025", and using Sheldon Brown's rule of replace when the chain is stretched 1/16" in 12 links, that means I'm 80% to the point of needing a new timing chain. Even at this level of stretch, it isn't stretched enough to shrink it with a half-link. And, on our ride this morning, the bike threw the timing chain for no particular reason on a flat stretch of road.

Any recommendations on new timing chain brands? (Or sources to order them from?) Looks like its time to order one soon. FWIW, I'm more interested in cheap, solid and durable than low-weight, fast and pretty. OEM is 154 links and uses 40T sprockets.