TIRES AND RED DOTS
02-27-2007, 03:00 AM
#5
3rd Gear Member
Join Date: Aug 2005
Location: TN
Posts: 945
RE: TIRES AND RED DOTS
This was covered in great detail just a few weeks ago!! Here you go.... https://mustangforums.com/m_2377871/tm.htm
02-27-2007, 02:13 PM
#9
6th Gear Member
Join Date: Feb 2007
Location: state of confusion
Posts: 7,635
RE: TIRES AND RED DOTS
Quoted in part from Yokohama
If you ever need to have the bead seal broken, such as to properly repair a puncture, you'll want these marks available so that the technician can make the appropriate match. Related to this is that the newest generation of balancing machines intentionally leave some residual dynamic unbalance, mostly as a means of allowing acceptable balance with less added weight. For the enthusiast, especially with wider tires and wheels than OE, this means that match-mounting becomes somewhat more important.
Norm
To facilitate proper balancing, Yokohama places red and yellow marks on the sidewalls of its tires to enable the best possible match-mounting of the tire/wheel assembly. There are two methods of match-mounting Yokohama tires to wheel assemblies using these red or yellow marks:
Uniformity (red mark)
Weight (yellow mark)
<snip>
Uniformity Method
When performing uniformity match-mounting, the red mark on the tire, indicating the point of maximum radial force variation, should be aligned with the wheel assembly's point of minimum radial run-out, which is generally indicated by a colored dot or a notch somewhere on the wheel assembly (consult manufacturer for details). Radial force variation is the fluctuation in the force that appears in the rotating axis of a tire when a specific load is applied and the tire rotated at a specific speed. It is necessary to minimize radial force variation to ensure trouble-free installation and operation. Not all wheel assemblies indicate the point of minimum radial run-out, rendering uniformity match-mounting sometimes impossible. If the point of minimum radial run-out is not indicated on a wheel assembly, the weight method of match-mounting should be used instead.
Weight Method
When performing weight match-mounting, the yellow mark on the tire, indicating the point of lightest weight, should be aligned with the valve stem on the wheel assembly, which represents the heaviest weight point of the wheel assembly. After match-mounting by either of the above methods, the tire/wheel assembly can be balanced.
Uniformity (red mark)
Weight (yellow mark)
<snip>
Uniformity Method
When performing uniformity match-mounting, the red mark on the tire, indicating the point of maximum radial force variation, should be aligned with the wheel assembly's point of minimum radial run-out, which is generally indicated by a colored dot or a notch somewhere on the wheel assembly (consult manufacturer for details). Radial force variation is the fluctuation in the force that appears in the rotating axis of a tire when a specific load is applied and the tire rotated at a specific speed. It is necessary to minimize radial force variation to ensure trouble-free installation and operation. Not all wheel assemblies indicate the point of minimum radial run-out, rendering uniformity match-mounting sometimes impossible. If the point of minimum radial run-out is not indicated on a wheel assembly, the weight method of match-mounting should be used instead.
Weight Method
When performing weight match-mounting, the yellow mark on the tire, indicating the point of lightest weight, should be aligned with the valve stem on the wheel assembly, which represents the heaviest weight point of the wheel assembly. After match-mounting by either of the above methods, the tire/wheel assembly can be balanced.
If you ever need to have the bead seal broken, such as to properly repair a puncture, you'll want these marks available so that the technician can make the appropriate match. Related to this is that the newest generation of balancing machines intentionally leave some residual dynamic unbalance, mostly as a means of allowing acceptable balance with less added weight. For the enthusiast, especially with wider tires and wheels than OE, this means that match-mounting becomes somewhat more important.
Norm
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