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Radial tires - evil or not?

 
  #31  
Old 01-12-2015, 08:01 PM
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Thank you for the link to the paper Stu. I saved a copy of it on my home computer for future reference.

I will continue to run radial tires on my old Fords, but I will pay very close attention to the tire inflation pressure since it affects the sidewall deformation cited as critical in the paper. I will also always run my radials tubeless.

It also explains why low profile radial tires always look low to me. The short sidewalls combined with the extra flex of the radial construction means that they are bulged out like an under inflated bias ply tire.
 
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Old 01-13-2015, 06:21 AM
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Well now that is some interesting info.
So, now for the next question. How do you date your rims?
I have my old innies, that I know are older, but I just bought some outies recently. These were made up to pretty recently. I have the 8 bolt rims, I would assume this style 5 bolt are similar. I will go look to see if I can find the R stamp on them.
 
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Old 01-13-2015, 09:18 AM
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Most wheels have a date stamp or code on them.





They can be anywhere, inside the rim, outside the rim, between the lugs, front, back, etc. You'll have to do some searching.
 
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Old 01-13-2015, 03:26 PM
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I have run Coker radials on stock rims at 40 psi on my F1 for the last 10 years. The previous 20 something years on bias tires. The ride and control is so much better on the radials. The pictured crack showed up last summer. Was it due to the radials or 65 years on the road? I don't know but will be always vigilant on observing the rims!
 
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Old 01-13-2015, 09:04 PM
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I spent time today going through materials I don't usually spend much time in looking for radial tire approval coding used by the wheel manufacturers. Besides the "R" codes mentioned above I found a reference for Accuride that said all wheels produced after 12/1/78 are approved for radial tires. I also found interesting a 1980 K-H reference that listed in one section their product line for all 1979 and earlier vehicles (silent about radials). Then in another section entitled " 'Radial Tire Approved' Changeover Wheel Listing" was an entirely separate grouping. Then I found in a Sept. 1981 K-H catalog a footnote showing they too had begun using the "R" inside a circle logo to signify radial approval, same as Accuride. The 1980 catalog had made no mention of this. The 1979 Budd catalog mentioned above is the first I have showing the use of the "R" in front of their part numbers. I'm missing the next earlier 1976 Budd catalog, but doubt it would have shown the coding given the 1979/1980 pattern seen across the industry.

I also found a February 1980 SAE paper on disc wheel technology that said the move away from riveted centers to fully welded centers was done to accommodate tubeless tires. It gives no time frame for the change, and it seemingly had no connection to the introduction of radials. Stu
 
 
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