I've been riding my late-'60s "hybrid" lately, Peugeot UO-18 mixte. I've converted it to 622mm wheels (700c) with 35mm tires and have more modern drivetrain components on it that still match the style ('90s Shimano 105) with a Sugino crankset. The main thing I need to find still is a chain guard to replace the largest ring. I'm using it as a 26-38 double. The cassette is an 11-26 7-speed using 8-speed Dura-Ace sprockets with 7-speed spacers. It's a bit cobbled together, and all parts were used or on-hand, but it makes for a really fun ride. Riding this bike just brings you back to the basic elements of riding somehow. It's essentially the late-'60s version of what something like the Specialized Roll is today.
IMG_20190629_092029483_HDR by
jnjadcock, on Flickr