Re: [Chrysler300] Danger of wheel failure unless the rims are

["Roger Schaaf" <obiwan10@xxxxxxxxxxx>]

I have a thought that perhaps the problem is not the replacement of a bias tire with a radial, but the replacement of a skinny tire(a 78 or greater series bias tire, with a 70 series or so radial tire).  This I would think could possibly place much more stress on the rim and its bead holding lip.  However in my personal experience I have never had such a problem.  

My experience with radials goes back to about 1970.  I had purchased a new 69 427 Corvette which came stock with G-70 by 15 bias tires.   Firestone had just introduced a radial tire(called the V-1 radial in a GR-70 by 15 size as I remember) so I thought that I would give them a try to find if I could improve the handling and ride of the Corvette.  I beleive that my local tire dealer probably replaced somewhere over 10 tires under warranty in an attempt to get a set of round ones.  Finally gave up on Firestone and installed 60 series radials from BF Goodrich(Radial TA's as I remember) which they had recently introduced.  They worked out very well and were far superior to the Corvette's stock bias tires in handling and ride comfort.  Have never tried a Firestone tire since then, subsequently in the late 70's and early 80's they almost went under because of the quality of their product.   As a matter of fact, everytime that I have wandered away from Michelin(even a blind Frenchman finds an acorn once in awhile) for my normal driving cars, I have always regretted it.  They are hard to beat for noise levels, ride comfort, truly round, no "radial pull"(I could write a book on this topic) wear,  handling and the ability to achieve an accurate dynamic(very important) and static balance.

Roger Schaaf
300 B
  ----- Original Message ----- 
  From: George McKovich 
  To: Chrysler300@xxxxxxxxxxxxxxx 
  Sent: Sunday, January 28, 2007 8:25 PM
  Subject: RE: [Chrysler300] Danger of wheel failure unless the rims are


  Is there anyone with "scientific" evidence that the wheels from 1955-1962
  were inherently inferior to those built after that period?? Also, is there
  any "scientific" evidence that RADIAL tires put more stress on wheels. From
  the stories that have been related thus far, it looks like there are more
  failures with NON-RADIAL tires being told. I have been told that the side
  walls on a bias-ply tires is stronger than on a radial with a comparable
  number of plies.... I was told this is one reason to use bias-ply tires on
  my car trailer amd they definitely do seem much firmer in the sidewall
  areas. Anyone with input???

  George



  _____ 

  From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
  Behalf Of Tony Rinaldi
  Sent: Sunday, January 28, 2007 11:52 AM
  To: Lettercars@xxxxxxx; Pete Fitch; Chrysler 300 Club
  Subject: Re: [Chrysler300] Danger of wheel failure unless the rims are

  Hi Gil,

  Regarding your awaiting a real tire expert¹s statement that the pressure on
  the bead area of bias ply wheels is greater when they have radial tires
  mounted on them, what about ³Old Tire Man¹s² quote:

  Nickname: Old tire man
  Review: You're neglecting a very important design fact when comparing radial
  and bias tires and rims: How the load is transferred through the tire to the
  rim. Radials transfer the load (vehicle + payload) to the bead of the rim
  and bias transfers the load upwards through the center of the rim, ie, bias
  rims are thinner at the bead area than radial rims. I was there when we made
  the transition to radials in the 1970s and I can't tell you how many bias
  rims I personally have seen 'peeled' at the bead when a radial tire was
  (wrongly) mounted. I won't mount a radial on a bias designed rim, but then I
  have many years of personal (in a professional setting) experience to rely
  on. Safety first.
  Date reviewed: Nov 24, 2006 10:24 PM

  This was in reply to an article:

  Classiccar.com

  A Tale of Two Tires
  A case for radial tires on your classic car

  http://www.business
  <http://www.businessweek.com/@@WsomwGQQ4NgSUwAA/autos/content/may2006/bw2006
  0> week.com/@@WsomwGQQ4NgSUwAA/autos/content/may2006/bw20060
  504_512529.htm?chan=autos_classic+cars+index+page_insight

  Regarding the ³K² wheel covers coming off, there are 2 recesses in the ³K²
  wheel covers that engage the 2 bumps in period Mopar wheels. They are on
  either side of the valve stem.

  Regards,
  Tony

  For those that insist on frequent cornering to the limit (not that there is
  anything wrong with that!) I would agree stronger rims would probably be a
  good idea. As to the assertion about the radial side wall flexing
  ("twisting") being worse for the rim bead area than bias---I'll await a real
  tire expert's statement before I buy that.

  However, I think that was a function of the "K" wheelcover's one piece
  construction more than the wheel.
  So there you are---my opinion on the subject and I'm stuck with it!

  300ly, Gil Cunningham
  Chilly Tallahassee, FL

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