Posted by Bob Kerr on August 20, 2007 at 17:30:17 from (64.12.117.74):
In Reply to: farmall m posted by 1965LONEWOLF on August 20, 2007 at 11:20:20:
I don"t know much about pulling or pulling tires, but I have done a lot of work getting a 68 GTO to hook up on the street with plain old street tires without a smokeshow and I have a feeling both are pretty close to the same. If the tread compounds are the same (and no sticky cheater tires)I found out there is a sweet spot that has to do with tire width and weight of the car on the rear axel both at rest and at full throttle. Since GM already did the tire pressure work (the pressure rating on the sticker in the door or glovebox and not on tire puts the tire downforce the same all the way across the tread) I put on several different size tires from wide to skinny.The worst tires I tested were wide L60s and the best were E78s and the second worse were the eagle ST 225/70s simillar to the G70, that I had on the car. the skinny E tires did much better and it was because of the lbs per square inch downforce on the tread patch. smaller tread patch, more lbs per square inch and more friction between tire and road.I could floor that car from a dead stop and it would barely squeal them and dang near pull the front tires off the ground! My buddies who I borrowed all the tires from all had their jaws on the ground. We put those skinny tires on for fun and had no idea they would hook better than the wide ones. I do not know for sure if that applys to dirt or pulling but I bet it does or is close! I do know an easy way to check tread patch on a tractor is to drive it on a limestone road and then go down a nice flat blacktop road and watch where the rock dust wears off. if the dust comes off in the center of tire only, let out some air till you have it where you want it. on the car or truck I use a crayon mark all the way across the tread too check it. I may be way off as to pulling on dirt, but heck, if it works you might leave them scratching thier heads.
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