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Myth or Fact: The pressure listed on the tire sidewall indicates the recommended pressure?

Myth or Fact: Tire pressure does not need to be regularly checked for vehicles equipped with TPMS?

When it comes to tires, there is a lot of misinformation out there. Check out our write-up linked below where we dismiss some of the common myths surrounding tires and tire safety.


 

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Got one for Ya !


It is said , always mount tires with the green dot aligned with the valve stem . Makes then easier to balance / less weight to add.
Some tire guys swear by it , some poo poo it


Most new cars n trucks come this way

What say ye tire man ?
 

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Great question, 24hrsparkey and I'll do my best to explain.

What you're referring to is a match mounting process for uniformity, which can yield less wheel weight.

Match mounting can be done in a couple ways. One way is by aligning the tires lightest spot with the wheels heaviest spot. The other way is by aligning the tires high point radial road force variation (high point) with the wheels low point radial runout (low point). The latter is how O.E. tire and wheel assemblies come from the vehicle manufacturer.

To identify the high point and lightest point of a tire, most tire manufacturers place colored dots on the sidewall - red for the high point and yellow for the lightest spot.

For wheels it's a little trickier as most wheels do not have permanent indicators for mounting uniformity. All O.E. wheels come from the factory with a temporary/removable low point "tag" that is then aligned with the high point of the tire. Once assembled, though, the tag is removed leaving the low point unknown to the eye.

It is commonly assumed that the wheels valve location must be the heavy spot, but that's not always the case. Years ago the valve stem was used to identify the heavy spot but nowadays the valve is typically placed due to aesthetic purposes, though some wheel manufacturers still follow this practice.

In summary, there are lot of variables and while aligning the yellow dot to the valve hole may be considered a good starting point, it doesn't necessarily mean the color indicator dots will wind up in the optimal position. The best way to match mount a tire and wheel is to use equipment capable of measuring wheel run out and tire force variation.

Hope this helps!
 

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Great question, 24hrsparkey and I'll do my best to explain.

What you're referring to is a match mounting process for uniformity, which can yield less wheel weight.

Match mounting can be done in a couple ways. One way is by aligning the tires lightest spot with the wheels heaviest spot. The other way is by aligning the tires high point radial road force variation (high point) with the wheels low point radial runout (low point). The latter is how O.E. tire and wheel assemblies come from the vehicle manufacturer.

To identify the high point and lightest point of a tire, most tire manufacturers place colored dots on the sidewall - red for the high point and yellow for the lightest spot.

For wheels it's a little trickier as most wheels do not have permanent indicators for mounting uniformity. All O.E. wheels come from the factory with a temporary/removable low point "tag" that is then aligned with the high point of the tire. Once assembled, though, the tag is removed leaving the low point unknown to the eye.

It is commonly assumed that the wheels valve location must be the heavy spot, but that's not always the case. Years ago the valve stem was used to identify the heavy spot but nowadays the valve is typically placed due to aesthetic purposes, though some wheel manufacturers still follow this practice.

In summary, there are lot of variables and while aligning the yellow dot to the valve hole may be considered a good starting point, it doesn't necessarily mean the color indicator dots will wind up in the optimal position. The best way to match mount a tire and wheel is to use equipment capable of measuring wheel run out and tire force variation.

Hope this helps!


What can you tell us about the heavy spot on the wheels with a TPMS sensor mounted ?



@Discount Tire

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DT , GREAT explanation and thank you ..

Sooo on a brand new truck .... we can assume the low point on the Rim is in correlation to the Tires High point Red Dot although the factory mark cant be seen on the rim anylonger

Annnd if one perminatly marks the Rim accordingly , bam you would have a place / mark to align the Dot from there on out .
Cool .

BUT the Dot on the tire soon goes away and is lost , loosing the factory Rims low spot / Tire Dot correlation forever.

You speak of Red- high point and Yellow- lightest spot Dots on new tires .... Man i have to look at some tires ,, all i remember is one green Dot . Could be wrong about that though...

AND the info about the valve stem area being traditionally the heavy spot on the rim , may or may not be the case on some wheels . Especially cast alloy rims that have the valve stem hole in a pleasing to the eye location , is great.

thank you , well done sir
 

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I have learned to check the tire pressures before leaving the shop as after a rotation more than half the time the TPMS have not been retrained so I get readings for the wrong tires. I also bought a training tool so if I forget to check before leaving and see the problem the next morning I do not have to waste a couple hours going back to the tire store.

Tire pressures are a hot pressure with air from the tire shops compressor so I do a cold reading the next morning and add air as needed to the tires using a 12 volt Viair compressor. What is great about the Viair compressors is that you can add segments of hose to get the length needed to get to the rear tires and they can provide the 80 PSI I need for my truck tires.
 
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