Re: [Chrysler300] 300 L wheels & tires

["Michael Reed" <mrreed@xxxxxxxxx>]

The Web site mentioned (Car / SUV / Van / Light Truck Tire Calculator) can be very useful. I would like to caution readers, however, regarding the "Wheel Circumference" value returned. The number is accurate, based on the "Overall Wheel Diameter" provided, and is valid for a wheel/tire carrying no weight and inflated. The page calculates the circumference mathematically. 

However, mounted on a vehicle, unjacked, the tire has a "rolling circumference" -- and it is not the same value as can be calculated. The "flat" at the bottom, where the weight rests, creates a tire that is not round. I don't believe the actual circumference of a tire can be calculated accurately, as the "flat" on a tire with weight on it varies according to a number of factors. Back in my racing days, we had to physically measure the circumference using a tape measure to get an accurate circumference value. Due to the larger 'flat' on today's radial tires the difference between actual and calculated is even greater.

 As the "Wheel revolutions per mile" and "Wheel revolutions per second @ 65MPH" are derived from the calculated circumference, those values are inaccurate also.

Mike Reed in flooded Lake Odessa, Michigan -- but the "F" is high and dry across the street....

  ----- Original Message ----- 
  From: Edward Mills Antique Tractors 
  To: Larry Nirenberg 
  Cc: rselby41@xxxxxxxxx ; 300 Club Server 
  Sent: Wednesday, December 31, 2008 10:25 PM
  Subject: Re: [Chrysler300] 300 L wheels & tires


  Larry Nirenberg wrote:
  >
  > Before I guessed I would go to this web site and figure out an
  > equivalent to the OEM radius tire in a 15" size. If you do this the
  > tire will definitely fit-
  >
  > http://www.net-comber.com/tirecalc.html 
  > <http://www.net-comber.com/tirecalc.html>
  >
  > ________________________________
  >
  > From: Chrysler300@xxxxxxxxxxxxxxx 
  > <mailto:Chrysler300%40yahoogroups.com> 
  > [mailto:Chrysler300@xxxxxxxxxxxxxxx 
  > <mailto:Chrysler300%40yahoogroups.com>]
  > On Behalf Of Roger Selby
  > Sent: Tuesday, December 30, 2008 9:29 PM
  > To: 300 Club Server
  > Subject: [Chrysler300] 300 L wheels & tires
  >
  > Hi 300 Friends,
  > I was driving my 300 L to the Sparks/Reno 300 Meet, last June, when a
  > gal
  > ran a RED light and took out my cars front end. A new clip, sub-frame &
  > 6
  > months later, it is out of the body shop. Arbogast Body & Paint, Auburn,
  > Ca. did a great job & are super people.
  >
  > I am now looking to put on Magnum 500 wheels 15X7 inch & 235/75/15
  > tires.
  > Will I have the clearance to run these larger, 15 inch tires?
  >
  > If anyone knows, please advise.
  >
  > Thank you, Roger Selby
  > Placerville, Ca.
  > 530-622-1020
  >
  > [Non-text portions of this message have been removed]
  >
  > 
  Diameter is only part of the problem - and don't for a minute believe 
  that all the same size tires are the same size. check the referenced 
  site for starters, but check vendor info on tire dimensions - especially 
  tread width. On several 235/75R15 I looked at there was more than an 
  inch difference in tread width - from 5.9 inches to 7.4 inches. If your 
  OE tire was 9.00-14 - BFG tread width was only 4.8 inches.

  Don't know about your application and wheel offset will also be 
  important - but on a non-letter 67 300, the 7.25 inch tread width on 
  15x6 with 0.5 inch inboard offset, they rub at both front and rear 
  inboard edges at extremes of steering. Factory offset for the 67's was 
  0.25 inch inboard and I think the 15x7 are 0.25 inch inboard so they 
  should be better than 15x6 with 0.5 inch inboard, but rub was at static 
  condition - tires will deflect inboard a bit under hard cornering.


   

[Non-text portions of this message have been removed]


------------------------------------

To send a message to this group, send an email to:
Chrysler300@xxxxxxxxxxxxxxx

For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm

For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/Chrysler300/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/Chrysler300/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:Chrysler300-digest@xxxxxxxxxxxxxxx 
    mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    Chrysler300-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/