275's on stock 9" rims is a little too wide IMO. Dunlop recommend a maximum of 265's for 9" rims and a maximum of 245's for 8" rims.
Use a race tyre not a hard as nails road tyre if you want the best performance. Dunlop DZSPZ1 are ok but far from a race tyre capable of ultra highend performance. The difference is stupid.
Before you all start, yes I do use them on the street come rain/shine and without issues.
I use Dunlop Racing DZ02G - 245/40 R18 for the front and Dunlop Racing DZ02G - 265/35 R18 for the rear on stock rims.
