[MaczPayne]

I've never run that setup in the front, so I can't say anything much about it. If you look at my rear tire the corners of the tread sort of bow up. I would expect that area of the tread to be fairly cool compared to the rest of the contact areas. That would also mean I'm not using the whole tread effectively.

I can give you real answers on the 275 + 9" wheel fitment the next time I take it out to the autocross and measure temperatures at multiple points across the tread width. From that you can probably derive an answer for going from a 235 to a 255 on an 8" wheel.