Ok, Here is an idea...
1. Go ahead and ban some tires from TIR (stay with me here...)
2. Place EVERYONE in open classes. No NOV, TIR or PRO magnetics, etc.
3. Go ahead and publish the results and award trophies for NOV, TIR and PRO as well as the regular open classes. Entry into NOV is voluntary and goes by the existing NOV rules. Entry into TIR is based upon your tire choice. If your tires qualify you are in. Entry into PRO is voluntary or maybe PRO just goes away.
4. If PRO goes away then just replace PRO with trophies for top PAX (like PRO already does)
What this means is that you could walk away with multiple trophies at a single event. It bumps up open class numbers. People can run what tires they want, but if the tire is on the exclude list they don't get included in the TIR results (R tires of course would be excluded from TIR). People don’t have to worry about “I ran TIR today and lost, but if I had run open class I would have won a trophy” issues.
STS/STX would kind of get the shaft as their inherint street tire PAX would preclude them from being included into the TIR class automatically unless you somehow automatically PAXed them at a *SP PAX which would be a headache for those in the bus.
If you are God's gift to driving you could win the NOV, TIR, Open and PRO trophies all at a single event. But you couldn't run in NOV the next time

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Richard Casto
1972 Porsche 914
2013 Honda Fit Sport
2015 Honda Fit EX
http://motorsport.zyyz.comMoney can't buy happiness, but somehow it's more comfortable to cry in a Porsche than a Kia.