OCR Text |
Show I MISUSE CAUSES mm tire Temperatures Make Heavy Jumps When Strains Are Increased Hcfc nre pome sermon facts for , drlers who arc careless of the reultV of over-loading automobile or iiuckai A and underlnflation of tires; I An average sized tiro, undf r proper ( lnflntion and normal load reaches a temperature of 140 degrees Falucn-j Falucn-j helt Just under the tread, when run at a speed at 25 miles per hour. in Increasing this speed to 35 miles per' I hour, the driver raises this tcmpera- turo to 155 degrees. I Now If this same tiro is overloaded I j by 50 per cent, the temperature will I reach 160 degrees nt 25-mlle speed, j And It will go to 100 degrees at 35 miles per hour. J Moreover, if this same tire is run 1 undor-lnflatcd, at 25 miles per hour 3 the temperature, is 180 degrees, and .1 at 3F. miles per hour It will rise to I 20 degrees. 4 Both under-inflated and carrying a 50 per cent overload. It will take only 30 minutes for the same tiro to reach i a temperature of 250 decrees when j running at 45 miles an hour. J In solid tires, overloading and In- j creasing speed has the .same effect as J noted above for pneumatic tires. A 1 temperature as high as 350 degrees I has been measured In a solid tire un- J dor adverse conditions. |