1929-05-09 — Page 11

THURSDAY, MAY 9, 1929.

THE CHINA MAIL,

11

AM THE MOTORISTS' PAGEE AN

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Hartford

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ON TYRES

POTENTIAL MILEAGE

WASTED

damage caused is frequently im possible to repair and the motor- ist will appreciate that through neglect of the air pressure ques- tion, a thoroughly sound tyre can be destroyed with very serious consequences to the tyre bill.

So much are tyre failures due to abuse by owners, that the various tyre firms have special

CHRYSLERS

NOTABLE SPEED TRIUMPHS

Chrysler cars have achieved notable triumphs in speed, dur ability and general performance

There are many ways in which/examination and testing organisa-contests in four foreign countries

tions, a part of whose duties it is to deliberately reproduce various forms of tyre abuse to prove their effects upon tyre life.

recently, according to reports re- ceived in Detroit from correspon- dents at the scenes.

Among them is the success scored by two Chrysler 72 road- sters in South America, one of which, piloted by Vietor Fabini, competed in the Seventh Interna- tional speed championship at Car- rasco, Uruguay,

The following is the second of a series of articles on the modern tyre, the first of which appeared in the "Ford Times":- potential mileage can be wasted by the unthinking motorist. It may be safely assumed that to day the pneumatic tyre is a

The Tyre Tread Prob- thoroughly sound article.

Apart from the damage which ably in no industry have such great strides been made in Im-under-inflation must obviously in- flict upon the tyre casing," it has proving manufacturing pro- cesses and in the acquiring of its effect also on the tyre tread. technical knowledge and

This may appear curious, but it skill,

should be explained that when the as in the Tyre industry.

Years ago there is no doubt tread is insufficiently supported that many cars were under-tyred by air pressure and is "labby," it

In the three-day International and even

when the tyres were teads to spread itself over the

over R muddy fully inflated they did not con-road and the constant scraping Reliability tour

on the course of 810 miles from Monte- tain a sufficient volume of air to movement of the tread

undue abrasion. video to Carrasco, two Chryslera support the load. Tyre manufac-road leads to

were among the seven

cars to turers have maintained close con- This is a type of unnecessary

attributable to finish out of thirteen entries. tact with car manufacturers and wear directly

The illustration 72 roadster, driven by Richarda this contact has resulted in ade-under-inflation.

a typical ex- Sanquinetti and carrying three quate sizes of tyres being fitted reproduced shows

passengers, was first with by far to the various car models as ample of such wear and it is un- standard equipment.

necessary to point out that by the best score. neglecting the inflation pressure We have said that the whole question, a motorist is needlessly secret of successful performance sacrificing a considerable amount in connection with pneumatic of potential tread wear. tyres is bound up with the ques-ncrease Long Haul tion of inflation pressure. In

The effect of the automobile on every case there must be a suffi- cient quantity of air in the tyre rail traffic in Canada has been that to support the load and to pro-long haul traffic has increased white vide reasonable shock absorption, short haul traffic has decreased, Although it is so obvious that says the passenger traffic office of pneumatic tyres depend for their the Canadian National Railways. satisfactory performance upon the air in them, it is still unfortun utely true that this inflation ques- tion is sadly neglected by many motorists. The motoring com- munity almost seems to adopt the attitude that the tyre manufactur- er in reiterating advice as to in- flation pressure is in some way making an excuse for his pro- ducts. When one examines the question closely, it is evident that the tyre manufacturer must, in season and out of season, preach inflation the doctrine of correct

Indation Pressure

pressure. Once his products get into the hands of the user, the potential mileage built into them ean quite easily be reduced to a figure which suggests to the no- thinking motorist that the tyre construction is weat or faulty. Everything is in the user's hands, and it is very wall worth while paying the necessary attention to the Inflation question, because correctly inflated tyres do have a proper chance of rendering the mileage built into them by their makers.

Test Pressures There are certain specific forms of tyre failure which are almost wholly attributable to neglect of the inflation pressure question. These types of failure can be avoided if only the motorist will make a firm rule to test his tyre pressures frequently and regular- ly. Once a week-should-be-suff cient in the ordinary way, and a prominent maker of inflation pres- sure gauges has adopted the slogan:-

"Test your tyres every. Friday." This is an admirable slogan and if the advice it gives was adopt- ed by every motorist there would be far greater general satisfac- tion experienced with pacumatic tyre service. In connection with pressure testing it is important to remember that it is quite impos. sible to tell whether a kyrė is ́under-inflated by its appearance. It is essential that a gauge is applied to the valve.

Incorrect. Inflation

Coming to the disastrous effects of incorrect inflation, it has been proved that the "casing" (which ja the very heart of a pneumatic tyre) quickly becomes fatigued when there is excessive, bending of the cord material on the should- er. This excessive bending must always occur when there is Jack of adequate air pressure and in time the "casing" will tend to break up at the point of flexing and the "plies of material will separate one from another. The

New

A

Another 72 roadster carried off the laurels at the Puebla races in Mexico.

Other foreign victories to the credit of the silver-winged Chrys- ler include two scored by A. H. Colliver in Australia.

During the time these cars were winning new acclaim, a long 72 sedan was upholding the Chrysler traditions of speed, power, and ́endurance in a daring run up and down the length of Africa.

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