<VV> Results of Tire Size Request / Price

[Mike Stillwell]

 On a related note - I've found a set locally and would like to know what is a good offer to make on them. This set has old cracked tires ans some minor chipping of the black paint, but otherwise look pretty good.

 Thanks - Mike
          YS-117

--- On Mon, 9/21/09, Bryan Blackwell <bryan at skiblack.com> wrote:> Bruce,
> 
> I matched them by revs/mile.  If you think about it,
> static diameter  
> doesn't really matter to the gearing, revs/mile does. 
> So, from the  
> BFG web site, Traction T/A:
> 
> 195/60-15 is 860 revs/mile
> 205/60-15 is 842.
> 
> Now, the late speedos are calibrated for 825 revs/mile and
> the Chevy  
> tire spec was 833.  Tire spec for 6.50-13 was 853
> revs/mile.  Problem  
> is, a bias-ply and a radial don't flex the same, so you
> don't end up  
> with exactly the same diameter tire.  A 205/65-15
> would be close in  
> diameter at 25.5, but on those wheels I'd be worried
> they'll hit the  
> fenders, and the revs/mile spec is 817.  You could use
> a 195/65-15 at  
> 832, which is right on the spec, but it's not an easy to
> find size  
> last I looked, and they are short in diameter as well at
> 25" even.
> 
> Thus, I stand by the 205/60-15 as the best fit for a
> Corvair with  
> 7.00-13s and 195/60-15 for cars with 6.50-13s.  The
> only significant  
> difference is visual (especially once you've moved the
> contact patch  
> out an inch), and I don't think most of our calibrated
> eyeballs are  
> good to 1/4" of ride height.  It's not misleading,
> beyond the fact is  
> that the tires today don't measure the same as the ones in
> the 60's.
> 
> --Bryan
> 
>