Show INFLATE TIRES ON HOT DAYS Terrific Driving Necessary to Generate Enough Heat to Raise Air Pressure Pres-sure in Tire. Motorists should again be warned against the notion that the heat of a summer day expands the air inside a lire to such an extent that the tires do not need to be blown up to the same point as in winter. Experiments show that it takes terrific driving at racing speed for a considerable period to generate gen-erate enough heat to raise the air pressure pres-sure in a tire five or six pounds. The expansion in a car. driven at an ordinary or-dinary rate on a hot summer day is so slight that no allowance should b( made for it when the tire is pumped up. Motorists would do well in hot weather to test the air pressure in their tires every few days to see that the leakage of air has not reduced the pressure to the point where the tire will suffer harm. |