Don't hate on the drifters and call them morons because they are setting the car up to not have traction. it's the exact opposite of what most other motorsports are doing.

I don't hate on you guys.

For the record, in my personal experiences with MX's (I'm sponsored by them, I get over 400 tires this year alone), I've found they run large. THe tires are physically wider than most other tire's i've come across.

I would do a 225-235 on an 8, no larger, and a 245 / 255 on a 9. this makes the sidewall very square, not bulging. The MX already does not have the stiffest sidewall on the market, anything you can do to keep it from bulging will improve response.

But hey, what do I know.