rim backspacing

Yes, EvilB1Dart has them also.

The wheels are not for street use, but some people have said that they do use them on the street. But it stands to reason that they will not hold up as well to pot holes, curbs and probably fast turns.

They could be made stronger with thicker centers and rim-halves, but they will be heavier. I don't know what his policy is on that or about any kind of warranty, but as mentioned, if one piece is damaged, it can be replaced instead of buying a whole new wheel. You would have to ask him about the cost and delivery time also.