What is the purpose of Red and Yellow dots in a brand new tires?

[nansky]

When buying brand new tires, you will notice that there are red and yellow dots in the sidewall. I presume that the said dots are guides for the location of the "pito" of the tires. But why there are two of them and color coded? Enlightenment please. Thanks.

[nicolodeon]

Well, your correct on that one. The red dot is a uniformity mark. This marks the tyres high point - the spot where the tyre is highest. The yellow dot (sometimes it's a yellow stripe) is the marks heaviest spot on the wheel. It's also known as a 'weight mark'. You aligh this mark to your air valve or PITO.

Them dots you see denote the uniformity and weight of the tyre. Tyre manufacturing is not exactly a precise/perfect process. AFAIK, it's impossible to manufacture a tyre that is perfect in shape, perfect in weight and perfect in dimension. This has to do with how the steel belts inside the tyre are manufactured and how the rubber is moulded. The tyres in the rubber would have a bit of deformation once the rubber has cooled down after manufacturing - and this bit of deformation gives the tyre a wobble. The tyre manufactures then use a process to determine where the wobble is. Once they find highest point of the wobble, they mark it with red. This process also determines where the tyre's heaviest point is. Once they find it, they mark it with yellow.

Hope this helps.

[theveed]

Amazing how often I see brand new cars not having those dots aligned. hehe

[MAXBUWAYA]

Amazing how often I see brand new cars not having those dots aligned. hehe

Pang wholesale kasi eh

[Automahn]

Mukhang di alam ng mga tire installers yung purpose nung dots. From my experience, 1 out of 10 lang ang nag-aalign nung yellow dot sa pito. Yung iba naman sa red dot tinatapat.

[alwayz_yummy]

may ganun pala! sa susunod ngang palit ng gulong papaayos ko yan...

[oliver1013]

hmmm interesting bit of knowledge

[boybi]

if the yellow dot/spot is the heaviest part of the tire, di ba dapat it should be placed at the opposite side against the pito to balance it?

[guido]

Mukhang di alam ng mga tire installers yung purpose nung dots. From my experience, 1 out of 10 lang ang nag-aalign nung yellow dot sa pito. Yung iba naman sa red dot tinatapat.

or baka naman sinasadya. para mas maraming weights gamitin sa balancing.

[mrpink]

and this is why bilib ako dito sa forum na ito .. you learn something new everyday ..