Would a drive shaft work in a bicycle? Possibly, and here’s a BMX bike concept that takes the design and runs with it, sans hubs! The hubless wheels are a cool touch, I’ll admit, but I have my doubts ...

Regular roller blades go way back, relying on a number of wheels mounted in a line and relying on regular bearings. [The Q] came up with an altogether more interesting design by handcrafting some tall ...