Factors responsible for over-heating:
(2) Over speed.
(4) Quick stops and starts.
(5) Insufficient spacing between dual tyres.
Tyre positioning and rotation to different wheel positions are extremely important to achieve satisfactory performance through maximum mileage and retreads.
It may be noted here that rear tyres wear more rapidly than front tyres, Again, the outside tyre in dual assembly wears faster than the inside tyre. Hence, planned rotation of tyres, from position will maintain the rate of wear equal. If the tyres are not rotated, uneven tread wear will reduce tyre life, Because of rapid wear of outside tyre in a dual assembly the twins become unmatched resulting in over-loading of one of the tyres in each pair.
Generally, it is advisable to “Break-in” new tyres on front wheels. After 1/3rd of the tread design is worn out, tyres should be changed to the rear positions. The light work imposed on the tyres when they are on front wheels enable the tyres to run cooler than the rear wheels. Do not forget the recommendations for dual tyre matching, when tyres at front wheels are changed to the rear dual assembly.
Sometimes, uneven wear on tyres may be found whilst then are on the front wheel. Since this uneven wear may be to some mechanical irregularities, tyres should be interchanged from left to right and right to
left immediately after rectifying the vehicle deficiency until they are worn out 1/3rd of the tread pattern.
Tyre Matching and Spacing Duals
Mismatching of dual tyres imposes on the larger diameter tyre, causing It to over-deflect and so get overheated. The smaller diameter tyre, lacking in equitable road contact, wears irregularly and faster than normal. Tread or ply separation, tyre body breaks and blow-outs are likely to develop from mismatching of tyres in a dual mounted assembly.
Proper spacing between duals is necessary to prevent the adjacent tyres getting each other rubbed at the side walls. Such a contact generates heat and causes thinning of the side wall rubber and may lead to separation and other premature failures. Use recommended size of wheel disc to avoid dual tyres rubbing against each other.
The life of the tyre greatly affected by the type of the road on which it runs. The roads may be of various categories 8uch ae, paved straight roads, rough abrasive roads, broken-up roads. Hilly winding roads,
wet smooth bituminous roads, etc.
The tyres that run for their whole life on good earth or gravel roads, can only be expected to render about 60% of the mileage that they would have given on smooth, level well paved roads.
Again, on very hilly roads, even where the road surface is good, the tread life will only be approximately 50% of the normal, because shuffle (wear and tear) of tread elements is excessive on winding roads during
Even if tyres of adequate strength and sizes are selected and tyre maintenance is good, tyre can be quickly and permanently damaged through bad driving habits. In reality, the life of the tyre is to a great extent, in the hands of a driver. Careful driving can do much to increase tyre mileage and save a substantial amount of money on tyres. High speed driving results in tremendous heat which is the enemy of a tyre. Similarly, quick stops and starts will grind off costly tread rubber and may cause flat spot-wear. Drivers must be careful to avoid obstacles and to keep away from po1-holes or other hazards which can damage tyres.
Vehicle Mechanical Irregularities
If the tyres wear irregularly, or more rapidly than expected, it may be due to some vehicle mechanical irregularities. Vehicle manufacturers provide their recommendations on wheel alignment, depending on the
characteristics of the vehicles.
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