CRG Discussion Forum
Camaro Research Group Discussion => Originality => Topic started by: Bryan302 on August 11, 2015, 09:52:41 PM
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Last year, during and after the Nationals, I noticed several people were talking about the correct alignment of the valve stem hole of the wheel with the tire itself. This particular topic was about a 68 Z.
Did the factory actually line up the tire and wheel?
Is this for both 68 DF and 69 YH tires and wheels?
If this actually happened, What is the correct alignment for a YH wheel and a Goodyear Wide Tread? Was the writing on the tire at 12 o' clock and the valve stem of the wheel at 6 o'clock? Please explain.
Thanks,
Bryan
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Something of that nature did occur but the version you heard is way off base.
Chevrolet Dealer Service Information Bulletin 68-I-5 dated December 5, 1967 explained a new process for mounting tires in production. Tire suppliers had begun marking the high run-out point with a red paint dot near the bead. Wheel suppliers noted the low run out point by welding BB shot on the wheel outer flange. In production these markings were aligned. Dealers were notified to maintain the alignment if it became necessary to dismount a tire.
Only three plants were involved at the time of the notification: Flint, Norwood and Willow Run.
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Ah so, I've noticed the bead you speak of, on the outer flange of my YH wheels, or most YH wheels. So would this bead on the wheel align dot to dot to the red dot at the high RO point of the tire? How would you establish the high RO point of the tire? Is this something the tire store could do on their balance machines? Does this service bulletin go into any detail to explain how this process is completed?
And you were right, I think the other camaro owners were just mounting each tire on each wheel at the same spot on each one.
As always, thanks William!
Bryan
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How would you establish the high RO point of the tire? Is this something the tire store could do on their balance machines? Does this service bulletin go into any detail to explain how this process is completed?
This was Chevrolet's solution to what they called "smooth-road shake" in 1969, to minimize the vibratory effect of tire and wheel runout. It continues today - if you look at the tires on a new car fresh off the haulaway truck before dealer prep, you'll see the various markings (paint, wax, sticker) aligned on the wheel and tire.
You can duplicate the results by having your wheels balanced at a shop that has a Hunter GSP-9700 Road-Force Balancer; go to www.gsp9700.com and use the locator feature there to find the shop/dealership nearest you that has one.
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The CDSIB does not describe how the manufacturers accomplished it.
Now all you guys with judged cars will have to add red dots on the tires and align the marks.
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Something of that nature did occur but the version you heard is way off base.
Chevrolet Dealer Service Information Bulletin 68-I-5 dated December 5, 1967 explained a new process for mounting tires in production. Tire suppliers had begun marking the high run-out point with a red paint dot near the bead. Wheel suppliers noted the low run out point by welding BB shot on the wheel outer flange. In production these markings were aligned. Dealers were notified to maintain the alignment if it became necessary to dismount a tire.
Only three plants were involved at the time of the notification: Flint, Norwood and Willow Run.
Great information William. I was aware of the reasoning behind the BB shot on the outer flange, but never knew the tire had a red dot applied identifying the high point runout. You learn something everyday...
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As I like to say we are learning more and more about less and less! But I enjoy the chase. Yup, lots more to learn.
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Thanks William and John Z, that's outstanding information! I imagine red paint will pick up in sales, and the judges will have to make an amendment to the book that they have not made yet! This can go along side the trim rings section.
Bryan
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How would you establish the high RO point of the tire? Is this something the tire store could do on their balance machines? Does this service bulletin go into any detail to explain how this process is completed?
This was Chevrolet's solution to what they called "smooth-road shake" in 1969, to minimize the vibratory effect of tire and wheel runout. It continues today - if you look at the tires on a new car fresh off the haulaway truck before dealer prep, you'll see the various markings (paint, wax, sticker) aligned on the wheel and tire.
You can duplicate the results by having your wheels balanced at a shop that has a Hunter GSP-9700 Road-Force Balancer; go to www.gsp9700.com and use the locator feature there to find the shop/dealership nearest you that has one.
John, your statement would indicate the process started in 1969, is that correct?
Great info William and John! Thank You!
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1968 model year Chick, I have the TSB and the "shots" on my FC rims....O7E car
BIG