I'm sorry to be the bearer of bad news. Here's what Hoosier told me on a phone call today.
Hoosier has eliminated the cantilever 22.5 x 7.2 -13 R20/25 which CM Formula Ford drivers use at the rear. The front we've been using is still available in the R20. Hoosier had to eliminate a wide range of tires across the spectrum of race environments. I was told that the dirt trackers have it worse than those using the circuit racing slicks.
Our rear tire size continues to be available in the R60 compound and it was suggested I run it. When I pointed out the issues with running R20 at front and R60 at the rear, or R60 all around, they responded that CM drivers could use the 22.0 x 8.0 -13 R20. The problem with that tire is it isn't cantilever and the recommended rim width is 7" to 9". Hoosier is going to mount it up on a 5.5" wheel and send me the results which I'll post as soon as they arrive in my email. Might be next week.
I did a brief check of Goodyear, Firestone, Bridgestone and they don't have what we need. Goodyear comes the closest but the compound is pretty hard. And of course Avon is going away. American Racer makes tires for FF but they only make them in their hardest compound.
Even if the 22x8-13 will fit fairly OK, it's not a cantilever and it will cause significant changes in handling. There's a very good chance it will not work on a 5.5" rim without offering a wild ride.
Of course, we could use the Hoosier radial but it's an R60 compound and that's worse than using the R60 bias plys that are available in our sizes for Club Ford. Either of those choices would severely decrease the pleasure of driving our cars in an autocross setting which is almost always on cold tires. Maybe on a sunny 90 degree day they wouldn't be awful. In any other weather it would be like driving on steel.
Even if some of us have good tires left over from last year, one set of tires or even two might not be enough to get through a busy autocross season. Or it would severely reduce the amount of events in order to preserve the tires. And then next year those folks will be at the same place most of us are right now.
One answer would be to change the rules to allow wider wheels which would then open up the options of soft compound Hoosier bias slicks. Talking to Brandon Kraus of Kraus tire he suggested that going to 6" and 8" or (in his opinion better yet) 7" and 9" would be the way to go. This would open up the range of Hoosier soft compound tires available if we switched wheels. However our rules makers might have difficulty with doing this. Obviously it wouldn't happen for this year. But it's something we should talk to them about.
Keeping the front at 5.5" would be OK since we have a tire for that. Then just use a 7" wheel for the rear.
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EDIT: I see now that the 7" rim is a custom size and would be expensive. I'm now thinking the FC size, 6 & 8 inch rims. And any new rule would include the allowance of continuing with 5.5" rims. And since 8" rear rims would allow an even bigger tire, then make the 22 x 8 a spec requirement along with the current tire we've been using all along.
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If not, CM as we know it is dead. Driving around on R60 compound is not any fun.