Yellow and Red colour dots in Tyre

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

This wheel is wrongly balanced

Yellow dots indicates that the part of tyre where yellow spot is given is the lightest part of tyre , It 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 heavy weight part of wheel rim/Alloy and that heavy weight part of a wheel rim/alloy is the valve stem.

When the lightest part of tyre is aligned with heaviest part of wheel it will get perfectly balanced or near to perfectly balanced.

Red Dots

Perfectly fitted for perfect balance-Red dot aligned to blue dot in alloy.

Red dots indicates the highest point of tyre. Part of tyre where red spot is given is the highest point in that tyre and that part has to be aligned with the lighest part of wheel /alloy, By looking in to 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 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 wheel.

When the highest part of wheel is aligned with the lightest part of wheel it will get perfectly balanced or near to perfectly balanced.

This tyre also wrongly balanced

Yellow and Red dots together in a tyre

When a yellow and red dots are given together in a tyre, then red mark should be given with more importance, when both the dots are given red dot of a tyre should be aligned to blue dot in the wheel(lightest part of wheel)

Why this marks

It is not possible to make a tyre which is perfectly balanced and perfectly circular. So tyre manufacturers gives this yellow and red dots to identify the imperfections easily so that a tyre technician can easily balance the tyre .