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. The change in volume from this additional flattening of the tire is quite small.
Mountain City is a town in Johnson County, Tennessee, United States. The population was 2,383 at the 2000 census and 2,531 at the 2010 census. Mountain City is the county seat of Johnson County. It is the northeasternmost county seat in Tennessee.
U.S. Route 421 (Shady Street) connects Mountain City with Bristol, Tennessee, to the northwest and Boone, North Carolina, to the southeast. Tennessee State Route 67 traverses the Doe Creek Valley on the north side of Doe Mountain, and connects Mountain City with Carter County and the Watauga Lake areas to the west.