WHEELS AND TYRES 18 4. WHEEL AND TYRE REPLACEMENT A. PRECAUTIONS DURING TYRE REPLACEMENT Following precautions should be taken while replacing tyres: 1. Whenever a tyre replacement is necessary, the new tyre should be of original equipment type. It should be of the same size, load range and construction as those originally fitted on the vehicle. Use of any other size or type may affect ride, handling and vehicle ground clearance and tyre clearance to the body chassis. Also be sure that the wheel rim size and diameter are the right ones for the tyre to be mounted. NOTE It is recommended that new tyres be installed in pairs on the same axle. 2. Rim bead seats should be cleaned with a wire brush or coarse steel wool to remove lubricants, old rubber and light rust. 3. An inflated tyre, even with low air pressure, must never be worked with a hammer while trying to correct an improper position of the rings. In such a case, the tyre must be deflated completely before the necessary correction can be done. 4. Whenever a tyre is dismounted from wheel rim it should be remounted such that the tyre and wheel rim are matched. If the tyre’s paint dot cannot be located, a line should be marked on the tyre and wheel rim before dismounting to assure that it is remounted in the same position. MATCHED TYRE AND WHEEL RIMS Tyres & wheel rims are match mounted at the assembly plant. For tyre & alloy rim assembly, match low point on tyre (Yellow dot) with high point on rim at Valve. For tyre & steel rim assembly, match high point on tyre (Red dot) with low point on rim (Blue dot). This is done to provide the smoothest possible ride. The colour spots on the tyres are originally marked by paint dot on the out board sidewall. The “low spot” is originally marked by paint dot on the wheel rim-flange. If properly assembled, the wheel rim’s paint dot should be aligned with the tyre’s paint dot. B. TYRE REPLACEMENT 1. Always use a tyre changing machine to replace tyres. NOTE For replacing tyre, follow the manufacturer’s (of tyre replacement machine) manual for installation instructions, recommendations and any other additional information. 2. Inspect the valve and replace the stem if necessary. 3. After replacing the tyre, inflate it to the specified pressure so that beads are completely sealed. 4. Balance the wheel(s) (Refer wheel balancing procedure). WARNING Do not use hand tools or tyre irons alone to change tyres as they may damage tyre beads or wheel rim. Do not exceed specified pressure when inflating. Do not stand near tyre when inflating. Bead may break when bead snaps over rim’s safety hump and cause serious personal injury. Do not mix different types of tyres on the same vehicle such as radial, bias, and bias-belted tyres except in emergencies, because handling may be seriously affected and may result in loss of control. Do not fit an inner tube to a tubeless tyre to overcome a problem of air leakage.
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