I am a period/vintage MTB enthusiast (read addict lol). I feel your pain. Either rims are scavenged or bso hoops must replace those whose brake surface has lovingly been thinned. 26in. Rubber, once the golden standard has become a Where's Waldo ordeal. Since when did reliability and simplicity become so undesired? Drives me nuts. And with "covid pricing" every "donor bike" is coveted like the ark of the covenant. I don't wish do go modern...no hydraulic full squish for me! My early 90s steel rigids (index is as high tech as I get) will alas probably go the way of the dodo...like me :/