Actually, after thinking about it again, I was a little off on the math...
The fronts are too tight in my book.
I would like to have 9.0" wide up front at least +20 or less - I would be more comfortable with a 9.0", +15 up front.
The 9.0" can easily take a 255 / 40 / 17, no problem, but no way that will fit up front under stock fenders.
The rears are fine in terms of clearance inside.
It's a matter of if it's going to hit the fender lip.
10.5" can easily support a 275 wide tire, but that's way too wide to fit under stock (rear) fenders.
I'm not sure what you're trying to do, but there's really no reason to run that wide wheels under an FC.
A 8.0" front and 9.0" is usually more tire (assuming 235 front and 255 rear) that most FC's need in terms of traction.
-Ted
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