With the tire 15 cm wide, the contact patch is 6 cm long. Now load the car with 50% more weight (500 kg). The additional contact area needed is 55 cm^2 per tire. If you assume that the side walls don't deform, the contact length increases to 9 cm.
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Logan County, KY Genealogical Society. August 8 at 7:05am Â·. Frank T. Gracey, of Adairville, assignor of one-half to Frank G. Wake, of Adairville, submitted for patent on June 5, 1900, for his device for making cigarettes.