The Birmingham age-herald., 1919-07-13
TIRE DEMONSTRATION
 GIVEN BY EXPERTS
The Birmingham Motor Co., Will Have One of the Mos Elaborate Displays of Tires for Demonstra-
 ton Purposes

wheel. and consequently. 1t runs with a wobbly motion.
 Now, if your tires are running true, if there IS no rregularity-there is only one source of wearing friction, the natural grip of the tread on the road But when tires do not run true. there is an addi- tional source of wear, the grinding of the road at an angle to the wheel This increases friction greatly and wears down the tread precisely as if it were being held against a grindstone.
 Test your wheels frequently for irregu- larities. Do it especially whenever any one Of your tires seems to show undue tread wear. Since the testing of wheels for alignment or wobbly motion is very simple, many car owners are protecting themselves by having it done by their Goodyear Service station or by doing it themselves, every two weeks.
 The use of an adjustable aligner is pest, such as is used by the Goodyear servlce stations. The illustrations show the steps in measuring wheels for align ment.
 Set both upright arms on level with the axle. Then place the tool between the lront wheels at the rear underneath the car, With the points touching the felloes, and tighten the set screws on both arms. Remove the aligner from beneath the car and note carefully the reading on the scale arm a
 After loosening the set screw on the scale arm, set the tool in position be- tween the wheels at the front of the car, with the fixed arm against the one fslloe When you have readjusted the scale arm so that the point is just touch ing the felloe, note the reading on the scale. The difference betwen this rad ing and the first will show you just how far the wheels are out of parallel.
 1T you do not have an aligner and find It lnconvenient to go immediately to a Goodyear Service station, the following stick method will secure acceptable results although not quite. as accurate.
 Take straight stick of wood at least five feet long. At the back of the front wheels place the stick between the spokes as nearly as possible on a level with the hub. Shove the stick through underneath the car until it touches the inside of the felloe of the opposite wheel at similar height from the ground Then mark with a pencil the point at which the stick touches the inside of the felloe of the first wheel Then re- peat the operation for the front half of the wheel and again mark the point where the inside of the felloe touches the stick. The difference between the marks shows how much the wheel is out of alignment.
 If the difference shown by either align CT or stick method is more than three eighths of an inch, take your car to your Goodyear Service station and have them find out the cause and correct it.
 Those irregularities that cause the wheels to wobble may be detected by lacking up the suspected wheel and shak- ing 1t to see if there is any play or looseness If any looseness Is found, it yr,di f1
 Then spin the wheel while holding pencil rigidly with the point close to the top of the side ring of the rim If as the wheel revolves, the space varies be- tween the pencil point and the rim, the wheel is not running true. This indicates that axle or spindle may be bent or the demountable rim may have been incor- rectly applied.
 The savings effected by detecting in time misaligned wheels or wobbly wheels. amount to as much as four or five thou sand miles for the tires affected-some- times more.
 Every stone-chp, piece of glass. bit of iron or tin, switch point and the like inflicts cuts on the toughest tread when fairly hit by the tire. If even one of these is neglected, it may cost you thou- sands of tire miles.
 tread cut is very much like wound on the sole of runners foot If he runs with it, the pressure of his weight will extend the cut and make it gradual ly larger. Dirt and grit will be forced in, will be crushed intort the flesh, and the wound will fested and spreaed infec- ton until it is thoroughly cleaned and properly dressed. Then proper steps must be taken to let nature fill it up.
 In a tread cut the results of inatten- ton are very similar. The elastic tread rubber is constantly spread by the weight of the car and the shocks of the road so that even a small cut in a new tire enlarges rapidly. At the same time dirt. sand and even small stones are forced into the wound until they go entirely. through the tread and into the carcass. Water, of course, also enters. furthers tread separation, and rots and weakens the fabric. Eventually stone, or a bump in the pavement, hit at a fair speed. will bring a bad blowout. It may be so bad that both tube and casing may be damaged beyond repair
 Inspect your tires daily. Have all tread cuts taken care of promptly. If repai: labor is scarce in your locality, do the work yourself if the cuts are still fresh and not too large. Never try to repair an old cut without getting expert ad- vice on it. If any tread separation or fa brio rotting has set in, repairing the cut without paying attention to these conditions is the very worst thing you can do.
 If you wish to repair new cuts your self, follow carefully these directions: Take a clean rag on the tool in the tire putty outfit or a stick and dip it into gasoline Thoroughly scrub out the cut, making sure that all dirt and grit are removed. After scrubbing thoroughly. to make absolutely sure that nothing is i'm bedded in the rubber clean vigorously a second time.
 Open a can of Goodyear patching cement, dip some of it out with the tool in the Goodyear tire putty outfit or use a flat smooth splint of wood. and ap. ply it thoroughly throughout the cut Also spread the cement for half inch around the cut on the outside of the tire as shown in the above picture Apply at least two medium heavy coatings and make sure that every portion of the -cut is covered.
 Let the first coat dry thorouxhiy before