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 ..

[lightning099]

Nice thread nga...this is very enlightening

[onewaytrip]

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?

i think the part of the rim with the pito should be the lightest because it has a hole. magaan lang naman ung pito.

[seonadancing]

I wasn't aware of any dots before I read this thread.

[slip-slick]

new tires are balanced when they are installed. weights are added where needed.. so whats the point of the dots?

[nicolodeon]

Well, like the tyre. almost all wheels/mags are not perfect so they are not 100% round or circular. The have minuscule imperfections that only machines (like the ones found at your suking tyre shop) can detect. If you look carefully and close enough, you'd find that your wheels/mags have notch or a mark stamped somewhere on the rim. Normally called a "dimple", this marks the lowest point of your mags. The dimple (lowest point) needs to be aligned with the highest point of your tyre (red dot).

However, there are tyres where the high point (red dot) is quite close to the tyre's heaviest part (yellow dot) and there are mags where the dimple is at the opposite end of the pito. If this is the case, then the red dot should be alligned with the mags' dimple - ignore the yellow dot.

Again however, as a rule of thumb used by experienced and well-knowledged tyre mounters, always align the red dot with the dimple and ignore the yellow dot totally.

[nikko m]

wow!nice info,so what happens if its not alinged?

[nicolodeon]

Well, these dots are properly aligned, the number of balancing weights (tingga) you would need to use would be minimized. Properly mounted tyres limits the RFV or radial force variation. If your tyres have a high RFV, the ride won't be that smooth and the ride won't be that comfortable. Plus, it lessens the effective performance of your car.

Medyo mahaba ang explanation sa RFV eh kaya eto na lang ang link sa Wikepedia, he he he. My apologies: medyo nerdy ang explanation dito.

What is Radial Force Variation?

[wrecker]

cool thread, i just had new tires and wheels mounted last weekend, check ko nga kung aligned.

[Eismann]

Interesting.....pero these marks has minor effects only for older rims di ba? Kasi naglalagay din naman ng weights to make sure of close to zero centrifugal drift during tire alignment if you fit new tires on old rims.....or maybe siguro dahil luma na rin yung rims kaya yun mismo ang may mga deformity contributing to the offset in centrifugal alignment.

[Linyx]

just get a new car..are these tyres correctly installed ?..cannot seem find the dimples on the rims but the yellow dot is aligned to the pito....

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