What's this wheel??
 

What is the difference between the stock crt.5 wheel and this BBT wheel??
Is this BBT have a 12mm hex too??

http://www3.towerhobbies.com/cgi-bin...?&I=LXUVV0&P=V

Yes, the BBT wheels have 12mm hexes. I like the look, but the plastic seems to be more brittle on the BBTs and they chip easily. I'm sticking with the stock wheels with hexes.

Stock crt.5 wheels are dish wheels and those are flat-faced wheels with a direct offset.