The 2010 rules refer you back to the FD website though I'm not sure I've ever found anything related to any of the rules on their actual website. I've always had to search the net for various rule books. The 2011 Pro rules are out there but somehow I didn't save it to my computer yet. I would image it too would have a tire appendix which referred me to the FD website.
Regardless, here's the 2009 Formula Drift Pro Rules section on tires in contrast to the Pro-Am rules I just listed above.
9 TIRES
9.1 TIRE ELIGIBILITY
Tires must be DOT approved and have a minimum production run of 2,500 tires, tires
available in the United States at regular retail outlets.
Tires must have a minimum tread wear rating of 140 (UTQG).
• 17 inch tires must have and MSRP of no more than $500.00
• 18 inch tires must have an MSRP of no more than $750.00.
• 19 inch tires must have and MSRP of no more than $1000.00.
Each entrant must declare their tire manufacturer as a part of the event entry form.
9.2 APPROVED TIRES
Only tires listed in Appendix C will be allowed. Teams who wish to use any size,
model, or brand not specified here must file for petition and gain approval from
FORMULA DRIFT.
9.3 MODIFICATIONS
9.3.1 Any attempt to modify tires in any manner is prohibited. “Grooving” or
“Shaving” of tires is prohibited.
9.3.2 The use of traction compounds or any other substance that may alter the
physical properties of the tire are prohibited.
9.3.3 Tire warmers or any other means of artificially altering the tire temperatures is
prohibited.
9.3.4 Tires must meet a minimum durometer reading of 49, hot or cold, at all
times during an EVENT, measured using an ISO868 or ASTM D2240
compliant Type A durometer.
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Nice Beard Brother!!!