[sqwert]

Just over 6000 miles on the originals on my RX3, and stretching and wear are evident. My TWs were all the same--daily lube and adjustment, sometimes twice a day on long trips, generally too worn to stay on the sprockets with the wheel all the way back by 5000-6000 miles. EK SRO on stock sprockets lasts 25000-30000 miles. Way cheaper in the long run to buy ringed chain because sprockets last 5 times as long. Also, much more ride time and much less maintenance time. Take your choice.

Already have replacement sprockets, 14 counter, +2 wheel. Simple source is CSC. Already have EK SRO on a big spool and a box of masters sitting in the shop.

Definitely go with a X- or O-ring chain. Many good brands available, but some charge by the name and are just marginally better than more reasonably priced offerings, if better at all. EK and RJK offer basic ringed chains at reasonable prices, either a good choice.

EDIT: SK also makes some excellent high dollar chains. Next purchase will be one of their X-ring styles. They cost more but last longer so overall replacement costs will be about the same. Sprocket costs will be reduced because they will also last longer. More riding time, less time maintaining/replacing chains and sprockets. Also, SK x-ring chains reduce drag and are lighter so slight power gain you'll probably never notice. The SRX2 runs about $75. The MVXZ2 is about $105. The ZVX3 runs about $130. The last two can be plus an extra $10 if you want color to accent the bike's. These top-line chains ought to last 40000-50000 miles with little maintenance other than an occasional rinse with Sea Foam Deep Creep, which floats crud off steel and leaves a dry, rust preventing coating, which is all a ringed chain needs.