Sum,
For MAXTON: SOME parts from the ECTA '07 rulebook, General Competition Requirements, page 12, 11-6 TIRES:
Up to 175 MPH: HR rated tires.
Up to 200 MPH: VR or ZR rated tires.
Up to 220 MPH: WR & YR rated tires or steel-belted drag radials.
Lot more to that section but think that covers what you are considering for now [to run at Maxton] until you get your new ECTA '08 book.
Ed