Salt Lake Tribune | 1916-08-20 | Page 28 | Underinflation Cause of Damage

CAUSE OF DAMAGE ) Fisk Expert Dilates on How Life of Tires Can Be Lengthened. About three out of every four tires that pass on to the scrap heap are prematurely prema-turely and needlessly worn out through underinflation, says a Fislc Rubber company com-pany expert. In an u nil orin Hated condition con-dition the tire is more susceptible to cuts and bruises; rim cuts anil fabric blowouts blow-outs develop because of the tremendous number of different positions the tire assumes, as-sumes, which tend to create internal heat and destroy adhesive qualities of the rubberized fabric. The motorist who is careful as to the air pressure will surely obtain large tire mileage at small cost. At tlie best, the tire is only a container con-tainer of air on which the car rolls. The amount of air necessary to carry will depend de-pend absolutely upon the amount of work that is to be done and the load carried. The motorist should determine the load for each tire and regulate bis air pressure pres-sure so as to carry that load without injury in-jury to the tire. To do this, weigh front and rear of loaded car separately and divide by two, which will give the weight as carried on each v.-heel. Now that the weight of load as carried by each wheel is known, determine the air pressure by using the factor given opposite tire size to divide the amount of the load, the result being the pressure i equired : 3- tnch tire, divide weight of load by 8. 3H-inch trei divide weight of load by in. 4- inch tire, divide weight of load by 1. 41-inch tire, divide weight of load by 14. 5- inch tire, divide weight of load by 10. o-inch tire, divide weight of load by 1. Example On a 4-in-h tiro -you find" the load to he 720 pounds. liefer to above table and note that on a 4-inch tire Yl is the factor: 720 pounds divided by 12 equals 00; therefore, inflate the tire to tiO-pounds tiO-pounds air pressure. Aa the ioad carried by the front tires is usually lees than on the rear, by usin the method iia suggested it will be determined deter-mined that less air pressure is needed. The ideal load for the best all-around results under average conditions is as follows: 3- inch tires. 400 pounds. 3l,2-inch tires, f50 pounds. 4- inHi tires, 735 pounds. 4 -inch tires, PfiO pounds. 5- inch tires, 121 0 pounds. j 5-inrh tires, 14S5 pounds. I A load heavier than these- figures may 1 be carried, but the resulting pressure necessary to get good tire mileage is usually very hard on the car and Us occupants. oc-cupants. To obtain best results weigh car as suggested, sug-gested, divide any load by figure given knd inflate to that amount; test air pressure pres-sure at lea.st once a week.