Answer the following by who would profit most, the racer or a promoter.
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Remove all rules on what you can do to tires and mandate a tire brand?
Remove all rules on what you can do to tires and mandate a tire brand and compound?
Use any tire and ban alterations?
Open tires?
My answer for what would be most affordable for most racers is "Remove all rules on what you can do to tires and mandate a tire brand?".
The only reason to ban prepping is so the life of the tire is not extended and racers will have to spend more money on tires. Sure it's going to cost more initially for those who can afford it, but there will be more used competitive tires available for racers who are not on an unlimited budget. There are two ways to prep tires. One brings the tire in for a specific night of racing and renders the tire useless afterwords. The second is to make the tire into a specific use tire and it will pretty much stay that way through out the life of the tire. Those tires will what knowledgeable less funded racers will purchase.
I think Bacon Bits is right on when he explained that softening is not all what tire prepping is about.
Tire prepping is just one part of equipment setup, driver preference, available hp and track conditions. It's a very complex thing to understand and be able to put all five of those items together and make your equipment perform as needed. The rest is about the ability of driver and crew to read the root cause of on track problems and be able to find the correct fix using four of the five variables.