Originally written by Brian Bodine from the pan car clinic he taught at Hangar 30, Seattle.
Tires, tires, tires…..
I think they are singular most important item on the car. While I think that you can get a car towork properly on mag/mag or pink/mag, you always need to consider what the yel/blackcombinations can do. Even if it means 2, 3 times the consumption. There is a quality about yel/black that simply excels in limited power classes. It’s likely the rubber content of the foam ishigher in magenta & pink that bind the car to the surface more then the low rubber content foams (yel, gray, black). That “binding” can rob some of the cornering potential of the car. That said, there are also good results with a blend; yel/mag. It all comes to the fine subtleties thatyou are looking for out of the car at the time on those track conditions. What seems like endlesspossibility of combinations is what really frustrates most 12th scalers.
Here’s some CRC combinations I would suggest:
Yellow – black, a very good combination for low power classes, doesn’t turn in to aggressivelyeven with 90% front traction, usually do not have to make special chassis alterations to get goodresults, may not always be the fastest combination to drive, very good for bumpy tracks, verygood for heavy traction on the carpet.
Yellow – gray, another good combination in low power classes, turns in more aggressively thenblack with 75% traction, may likely need to CA the edges, may need to add a front brace or gostiffer on a front spring, set up window will get narrower to hit to get good results, good forbumpy tracks, good for heavy traction on the carpet.
Graylow – black, along with being just a bit more durable then yellow, g/l will “stick” the rear endjust a little bit more and not have that “free” feeling of yellow, a good tire to use when cornerentry is a bit unpredictable currently on yellow, this is usually not a fast combination for clubtracks, only used this combo at big races or a heavy sauced Jack track.
Graylow – gray, this is a combination that may only work at big races that the traction is gettinghigh and you are coming from yel/black, fronts will need CA, may need less reactive caster, mayneed front brace.
Yellow – Magenta, more aggressive then gray fronts, fronts will need CA, better on smoothertracks, better with medium grip track, should work better in a heated environment, will need tobe trued small (41/42).
Graylow – Magenta, just a little more stable in the rear then the yel/mag combo, used very littlein the past, will need to be trued small.
Pink – Magenta, a very good combination for medium power classes, better on smoothertracks, fronts will need CA, good in medium grip tracks, may need front brace or less reactivecaster, may not work with heavy Jack tracks – look for car to get too tight on the nose or loosefrom the rear late in the run, could be building temperature sensitive.
Magenta – Magenta, a very good combination for medium & modified power, better onsmoother tracks, fronts will need CA, may need front brace or less reactive caster or lesscamber gain, may not work with heavy Jack tracks – look for car to get too tight on the nose or loose from the rear late in the run, could be building temperature sensitive.
Magenta – pink, mag rears, pink fronts that is, good for modified racing in order to get enoughsteering.
White and Gray rears are missing from my list as they are rarely used.