Why am I just ROASTING drivetrains?
Context—I've logged ~60k miles over the last 13 years. I build my own bikes and I'm pretty obsessive with maintenance. I replace chains as soon as I can get the chain checker (Park CC-3.2) in with a little pressure, which results in slightly less than 0.5% wear. I lube chains (Rock N Roll gold for road, blue for gravel) every 50 miles or 2 rides, whichever comes first. I'm a lean 220lbs and have a 300-350w FTP (been a while since I tested) and I know that this will lead to faster drivetrain wear.
My road bike (Ultegra 8000) has 15.2k miles and I changed the cassette at 9.2k and the chainring/chain at 11k. Since then I've had to replace the chain at 12.2k, 13.5k, 14.5k, and 15.2k. The cassette tests fine with the Rohloff chain checker but I replaced it anyway this time.
My gravel bike (SRAM Force AXS... I use the Park CC-4.2 due to flat top chain) has 3600 miles and the first chain wore out at 2100 miles. I figured I would start checking it when I got within ~500 miles of the 2100 miles the first chain lasted. The chain checker fell in with no pressure. I replaced the chain and it's skipping under load so I clearly waited too long.
How am I killing chains so fast with such diligent maintenance? 700 miles on the last road chain is insane.