I'm surprised about the inventory thing. I ride an 03 Cannondale road bike that uses all standard stuff— screw-in bottom bracket, band-on front derailleur, 9-sp

I'm surprised about the inventory thing. I ride an 03 Cannondale road bike that uses all standard stuff— screw-in bottom bracket, band-on front derailleur, 9-speed shifters. I've always been able to get parts for it off the shelf at multiple shops, to the point that basically nothing on it is original other than the frame. But this has even been the case with my much-weirder winter bike, my kids' bikes that have off-brand shifters, etc. I know Sheldon Brown (RIP) catalogues a true nightmare history of incompatibilities that have built up over the years, but I think in reality, most of that stuff is pre-1990. If you have a non-imported bike purchased in the last three decades, it's going to either be Shimano or be knockoff parts that are Shimano-compatible.