Randy,
The rules for the Proxy race state we will be running the series at 12 volts. The rules for our 2020 Q4 series listed 14 volts but we are not using those rules. We are using the rules for the Proxy. Thanks for asking the question.
Front tires – you can use the 17″ or 19″ diameter versions of the zero grip tires. It depends on how you are setting up your car. You might find the 19″ version easier to set the car up with.
On a side note – are you up for selling your Bosch Alfa? I would like to purchase it if you are up for selling it. Let me know what you want. It would be great if you could leave the car at headquarters and I will come by with some cash to leave for you.
Marty