liam.mccaffrey
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| posted on 10/4/08 at 11:26 PM |
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Tyre Spots, Red and Yellow
Having my tyres put on tomorrow, they have red and yellow spots on them,
can you remind me what the spots are for?
red opposite the valve?
yellow is the heaviest spot?
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Hellfire
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| posted on 10/4/08 at 11:34 PM |
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Yokohama R888 Tyre Mounting
Depends on how you want it mounting:
Observe match-mounting procedures
Proper tire and wheel assembly balancing is important from a vehicle safety standpoint. In high-speed driving, improperly balanced tire/wheel
assemblies will cause a vehicle to lose stability and not operate in a safe and comfortable manner. Improperly balanced tire/wheel assemblies also
cause abnormal treadwear patterns.
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)
Warning: Improper mounting, underinflation, overloading or tire damage may result in tire failure, which may lead to serious injury. Tire and rim
sizes must correspond for proper fit and application. Never exceed 40 psi to seat beads.
Warning: Tire changing can be dangerous, and should be done only by trained persons using proper tools and procedures established by the Rubber
Manufacturers Association. Failure to comply with proper procedures may result in incorrect positioning of the tire, tube or wheel assembly, causing
the assembly to burst with explosive force sufficient to cause serious physical injury or death. Never mount or use damaged tires, tubes or wheel
assemblies.
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.
Good Luck - Steve
[Edited on 10-4-08 by Hellfire]
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907
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| posted on 11/4/08 at 05:06 AM |
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I've just got to ask....
Why don't tyre fitters use these marks?
Paul G
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Hellfire
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| posted on 11/4/08 at 06:50 AM |
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Dare I suggest that the reason they dont use this aid is that our fully trained Tyre Fitting staff dont actually know what the dots are for....
Steve
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TGR-ECOSSE
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| posted on 11/4/08 at 08:00 AM |
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We were always told the date code should be to the outside.It will be like this 1408,week 14 2008. Tyre fitters will just fit the tyre on the rim any
way because most of the tyres you get in tyre fitting depots are second quality balance wise. The perfect tyres all go to the car manufactures hence
no balance weights on new cars but when you get your tyres replaced they need balanced.
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owelly
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| posted on 11/4/08 at 09:31 AM |
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After watching the local tyre monkeys pile three layers of stick-on weights on SWMBOs Jeep, and still not get a decent balence I suggested that they
put the little red dot next to the valve (there was only one dot). Hey presto! 5g needed. They all gathered around to marvel at such a bizzarre
revelation. None of the six guys there had heard of such black (pun intended) magic.
As I was leaving, I noticed one of the old guys fitting a tyre, without any regard to the dot........oh well.....!
http://www.ppcmag.co.uk
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