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rdane,
The first question which comes to mind is, "What are the rules of your class in the hillclimbs?" More specifically, are you required to use a "DOT approved" tire? Stock wheel sizes?
As you so correctly point out, the lower the profile of the rear tires, the greater the torque. Likewise, your point about unsprung weight ( in this case, wheel+tire ) is critical, and right on the money! However, an area you might be overlooking, because it seems so obvious, is mechanical GRIP. Without it, all the rest is just fanciful theory . . .
So, IF we were running hillclimbs or Solo Ies, and IF we were limited to near-stock wheel sizes, and IF there were no restrictions on rubber, we would have a set of soft-compound GoodYear or Hoosier slicks - without question. Supreme GRIP!
Assuming you need to stick to (pun intended) DOT Approved tires, Hoosier A3SO4 s ( or maybe now the new A3SO5 s ) are unbeatable. They come in nominally 225-50 16, and 245-45 16, but placed side-by-side with other "R" radials, they have a much lower profile, which should help your front rubbing in bump mode. The "A" compound is made specifically to heat up quickly, where one does not have the luxury of 1 or 2 full laps to get them up to optimum traction. GRIP!!
Good luck,
Ed LoPresti
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