"Very similar to how Sprout's joints work, even looks like the cutting process is similar (pocket cut with one side cut with a dovetail or similar) https://sprout-kids.com/collections/wooden-montessori-furniture-for-home"

"Tubolito makes a similar tube both in materials and price. Been riding them for a while and they work pretty good, not really that much more puncture resistant in practice. Patching may be better on the scwalbe's but on the tubolitos it isn't awesome."

"Motorcycle chain... not bicycle chain. That is way way wider then a bicycle chain."

"The better question logistically is how do you prevent the elevator from becoming a bottle neck that jams up the tunnel?"

"If your bike seat is placing pressure on your perineum... then you need a new seat. This is a solved problem in seat design many times over. Many reasonable local bike shops will size you for a seat and point you in the right direction.Seats are designed to place nearly all of their pressure on the sit bones. If the seat isn't... then it doesn't fit you properly."