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At 3501 they will recieve a +0.3 and for the 275 you will recieve a +0.4
So if you have a car that makes 435 rwhp and weights 3501 this would give you a power to weight of 8.04 then you add the +0.3 for the higher weight and the +0.4 for the smaller tires.
This gives you an adjusted power to weight of 8.74 and therefore legal for ST2.

Hope that helps,
Joel

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Corvette Track Medic
#222 - 09 & 12 TTS Nat Champ
#153 -10 & 11 TTA Nat Champ

Exactly. Will be curious though if A6 275/18's can last for a nationals race well under all that weight.
Hoping its a cool day

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2012 Boss 302s.#37
"Move out of the way racing smurf is coming thru.."

i dont expect to see anything like that kind of rwhp with my mustang.

375-380 maybe

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Rob Bodle
Rob Bodle Images/RBI Competition
Mustang FR500C #15
http://www.facebook.com/rbicomp

My car is +/- 3150 and the 275's (not considering shock fatigue) fall off a good bit after about 25min at Rd Atl. I can't imagine what they'd be like after 30min at a place like MO with that much weight and power. I would think that tire choice/maint would trump power in that situation.

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#27 '99 FRC
TT3/TT2/ST3/ST2

The catch is when was the last time one of our races was green for 40 minutes or even 30...

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2012 Boss 302s.#37
"Move out of the way racing smurf is coming thru.."

So huge 22 car field so far in ST2 looks like.

Nice range of vehicles. Will have to see if us Boss 302s's car upset the vette's.

Was running only 1.5 seconds off pace this past wknd with R6's at 14 heat cycles and down 20rwhp so feeling optimistic.


My guess is high 31's and 32's constant will be needed for top 3 for sure.

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2012 Boss 302s.#37
"Move out of the way racing smurf is coming thru.."