Bike parking: build these. Just these. That’s *it*. These stands can accommodate any type of bike. And you can lock the frame to them.
Don’t build ones where only the wheel goes in. Don’t build anything where the mechanism can go wrong.
I know this is boring. But IT WORKS!
Edit: to those going “they can be cut and taped and bikes stolen” - I know. Do I care? No, not really. Tell me a type of rack that can’t be cut with an angle grinder!
@jon Oh, correction: the other type I see used as-designed are the two-level stackable bike parking racks, which have a very long slot to fit your bike wheel into, and a wheelbender at the end. But those are generally only economical at train stations and such, so I consider them a special case.