They look like regular-sized touring tires to me, based on the scale of the whole thing. In fact most of the suspension components seem to be sized about the same, the chassis is considerably shorter, though.
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Well, I don't know what class I can race it in, but I bought one anyway.
Here's some detail pics for those who haven't been able to see one close up yet (which is most people!) It's a really cool little car I can tell you
I don't see the lack of provision for 6 cells as a problem. As far as I'm concerned I'll be treating it like a 12th scale, 4 cells and say a 12 turn motor. I'm sure that's going to be quick enough anyway!
Certainly a lot of other people down here have expressed a desire to buy one now that they've seen mine in the flesh.