I would like to also like to exclude the use of the F series of tires. These provide to far of a performance gap for those they have the tire truers and have the time to make them work. I for one don’t have 4-5 hours truing and rounding a set of tires.
One of the reasons we did a spec motor was to prevent people having to spend time and money to find that one gold motor that worked. We’ve replaced that issue with tires. The F series tires are inconsistent at best just like the BRM tires. I would be open to limiting the tires to P6 in 19×10.
Just my $.02.