This is just a little bit off topic. But, I’m currently trying to get some info on an old Peugeot frame I have, and am actively riding, so that I can replace the traditional BB with a cartridge BB (trying to find out the standard so that I can order the cartridge before taking the bike apart). So far, it appears that the bike is from a time when Peugeot was apparently transitioning from either French or Swiss standards to British, UK, ISO, or something else. I have the frame serial number (YSC4 26297), but trying to decode that seems unreliable. I’ve re-opened several old BF forums, looked on various websites, etc. But here’s the thing…looking through all this info, and the formatting of serial numbers by various frame building companies…it got me asking “Why couldn’t there have been one simple-to-decode format among all frame builders?” Most companies used lengthy, cryptic serial numbers that could have easily been something like, for example, an easy to decode “PEUGEOT 12/06/1990” or in the OP’s situation “TREK 12/06/2020” instead. Why? — Dan