Originally Posted by

**2_i**
As to experiment, this was the type of answer I was looking for. As to theory, obviously, in a micro bike the wheels must be subjected to 4 times or so larger tensions than in rollerblades. If they take it OK, they must be pretty overengineered. Otherwise, for 120 kg rider+bike and 5 bar pressure, the tire patch must be 12 cm^2. For a rollerblade wheel I cannot imagine the patch to be larger than 2 cm^2, but, admittedly, I do not have much experience with those wheels. Putting 60 kgf on each wheel yields stress of about 3MN/m^2 which is close to the tensile strength of some common materials, e.g. brick. I hope that I do not make a mistake here, but this implies that you might damage brick when riding on it with a micro bike.