Re: Tire Diameter

[jmbrodsky@domain.elided]

     Steve,
     
        I'm not entirely sure where the number 2.5% came from in 
     whoever's post it was.  I'm pretty sure that tire manufacturers 
     adhere to a standard so that when the tire is loaded to it's rating 
     (usually like 1150-1700 lbs for an LT tire) it won't be more than 
     XX% of it's intended unloaded specified psi diameter.   The side of 
     the tire has a weight rating and a psi rating cold.  This has an 
     included safety factor to allow for Brake/Road friction heating, 
     ambient heating, atmospheric pressure, load changes, etc.   I was 
     rather surprised to hear the 2.5% actually,  I think the number is 
     closer to 10% reduced at load.  ie.  31" tire shrinks 3.1" loaded.
     
        Anyone else have ideas?  I suppose if we all called our favorite 
     tire stores we could compile quite a list of lies, only to weed 
     thru and find the truth!
     

     -Joel Brodsky

         '76 IHC Scout II 345/tf727
         '75 IHC Travelall 150 4wd 392/tf727
         '72 Chev Carryall 3dr 4wd 350/th350 sold, but not forgotten.

-----INCLUDED MESSAGE FOLLOWS-----


______________________________ Reply Separator _________________________________
Subject: Tire Diameter
Author:  Steve Stegmann <stegmann@domain.elided> at CCGATE
Date:    12/1/97 3:27 PM


Joel,
     
I apprediate the info on the 2.5% reduction in tire diameter.  Anything 
else you might have would be interesting too.  I'm putting together some 
info on wheel balancing and this might be helpfull.
     
Steve
     
---------------------------------------------------------------------------- 
Steven A. Stegmann
     _/_/_/    _/      _/_/_/ "No free man shall ever be debarred the use
   _/    _/   _/_/   _/    _/  of arms.  The strongest reason for the 
   _/        _/ _/   _/        people to retain the right to keep and bear
    _/_/    _/  _/    _/_/     arms is, as a last resort, to protect 
       _/  _/_/_//       _/    themselves against tyranny in government"
 _/    _/ _/    _/ _/    _/    
 _/_/_/  _/     _/ _/_/_/         Thomas Jefferson, June 1776
----------------------------------------------------------------------------