Have you seen yellow and red dots which are given in car tyres at some spots, Some of the tyres will have yellow color dots and some others will have red dots but some of the tyres will have both red and yellow dots.
Yellow dots indicate that the part of tyre where the yellow spot is given is the lightest. Part of tyre, will not be noticeable while driving the car but can be identified when checked with a machine. When this marking is given on a tyre a tyre technician can easily balance the tyre by aligning the yellow dot mark to the heavyweight part of the wheel rim/Alloy and that heavyweight part of a wheel rim/alloy is the valve stem.
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When the lightest part of tyre is aligned with the heaviest part of the wheel it will get perfectly balanced or near to perfectly balanced.
Red dots indicate the highest point of tyre. Part of tyre where the red spot is given is the highest point in that tyre and that part has to be aligned with the lightest part of wheel/alloy, By looking into this marks a tyre technician can easily identify the heaviest point of tyre and that part can be aligned with the lightest part of wheel/alloys, lightest part of a wheel/alloy will be marked with a small blue sticker or with a small circular dot, if these markings are not available it can be checked with the help of machine by expert wheel technician, so that he can easily fix the red mark towards the lightest part of the wheel.
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