My “folding” bike isn’t really a folding bike: it comes apart. It was originally based on the Raleigh 20. It has 20” 406 wheels with 20x1.5” tires. It is stiff as a brick because I built it using a lot of scrap tubing I had left over from building a tandem and triple to ride with the kids. It is also a bit heavy. Originally I built it as a 10 spd, but over the years it has been rebuilt a few times and now it has 3x8 setup with 28-42-54 rings and 12-32 cluster and cantilever brakes. I have ridden it to work in the past when I was bicycle commuting. I had to ride bike paths and other rough roads. The 20x1.5” tires did a pretty good job of absorbing the nasty road surfaces. My mode of commuting with it was to take it apart enough to get it in my old Karman Ghia and drive past the worst of the city traffic and park and ride through the park about 10 or 12 mi. to work. I also had a couple of other bikes to choose from, so I didn’t get too board with it.