Mounting Tire On

Before installing tube in tire, all dust and dirt, particularly hard particles which might chafe an inflated tube, must be removed. Wipe tube and inside of tire thoroughly with clean, dry cloth. If rim is dirty or rusty, clean with a stiff wire brush. Be sure to examine a used tire carefully for fabric injuries that may damage tube.

Before mounting tire, see that rubber rim strip is in place in rim-well, and that rim strip valve hole registers with valve hole in rim.

Tire balance mark on Firestone tires is a red triangle and on Goodyear tires a red dot.

Insert tube in tire, (placing valve at tire balance mark). Swab thoroughly all around base of tube, between the tube and side walls of tire with a heavy suds solution of tire mounting compound and water. Bead seat of tire should not be coated. Inflate tube just enough to round it out. With wheel lying flat, place tire on rim and align valve with hole in rim.

Push bottom bead into rim-well near valve and hold in well while forcing remaining portion of bead over rim flange with a tire tool.

Spread tire and insert valve through hole in rim.

Force upper bead over rim flange and into well at point opposite valve. Stand or kneel on this side of tire to hold it in well and pry remaining portion of tire over rim flange. While forcing bead over rim flange, keep as much bead as possible in rim-well. Be careful not to damage beads or pinch tube. Inflate tire to recommended pressure and check valve for leak. See tire inflation pressures in "Tire Data," Section 1A.

After inflating to recommended pressure, completely deflate to smooth out any wrinkles in tube and allow tube to find its place, free from strain or stress. Again inflate to recommended pressure and check valve for leak.

When a racing motorcycle or car is being groomed for an event on road or track, just as close attention is given to perfect condition of wheels and tires as to engine tuning for maximum performance. Wheel bearings are checked, wheels and tires are checked for out-of-true sideways, eccentricity, out-of-round, and out-of-balance. Careful attention is given to anything found not just right. If a tire tread is found worn irregular to an appreciable degree, tires are transposed or a new tire installed. Inflation pressure is carefully adjusted to the poundage known to be right for weight of vehicle and nature of event.

In other words, engine R.P.M. and horsepower don't mean anything unless the vehicle being driven can be guided with ease and safety at top speed. If, due to faulty wheel and tire condition, a racing vehicle develops wheel hop, shimmy, or some other bad handling condition which makes control difficult at high speed, it might just about as well be without an engine.

Stock model motorcycles of today are approaching the speed of racing model motorcycles. Therefore, due attention to wheels and tires of stock motorcycles driven solo at hi&h speed is just as essential as in the case of a racing motorcycle. Too many motorcycle mechanics are pretty much engine and horsepower minded, and as a result are inclined to consider wheels and tires something secondary to be given attention only after something fails, or a rider complains of serious handling irregularities at high speed.

Riders as a general- thing do their own tire inflating and a wide variable is found in the pressures to which they inflate. This probably is mainly because no one has taken the time to impress them with the importance of correct inflation pressures according to load and tire size, and to enlighten them as to the influence this has on good or bad high speed handling. One motorcycle will be found with 10 lbs. tire pressure; another with 25 lbs. or more.

Here and there a rider transposes his tires to avoid excessive irregular wear of front tire tread and to equalize tire wear, but most riders don't make this a practice because they don't realize it is a must, if high speed handling is to be kept at its best. A tire kept in continuous front end service long enough to allow tread to wear quite noticeably irregular and peaked, is very likely to handle poorly at high speeds especially if over-inflated.

When a rider complains of bad handling at higher speeds, check as follows and give attention as needed:

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