<VV> Supply of 13" Tire Question

[Bill Hubbell]

Well, that's interesting, Bruce, but I think you are wrong.  You see, after
I had the P175/80R13 tires mounted, I compared them to the mounted bias ply
tires on my show car (B78-13s - original replacement tires for 6.50-13) and
they are the same size - 24" - in diameter.  I also measured some original
6.60-13 mounted tires (with good tread!) I have in my garage and they also
have a 24" diameter.

Bill Hubbell

p.s. When and where is the "Corvairs in the Curves" autocross held this
year?

----- Original Message ----- 
From: "Bruce Schug" <bwschug@charter.net>
To: "Bill Hubbell" <whubbell@umich.edu>
Cc: <markt17@fuse.net>; <virtualvairs@corvair.org>; <mark@noakes.com>
Sent: Wednesday, May 26, 2004 1:09 PM
Subject: Re: <VV> Supply of 13" Tire Question


> You're right, Bill. However, I'd like to comment on your recommendation
> for tire sizes. The 175/80-13 is somewhat smaller than the 6.50-13 was.
> A better replacement for the 6.50-13 is the 185/80-13.
>
> If you look at the specs on the Sears tires you'll find that the 175/80
> is 24.0" in diameter. The 185/80-13 is 24.7" diameter. These are
> typical dimensions for these sizes. Unfortunately, there are no revs
> per mile specs given.
>
> Now if you go to:
>
> http://www.coker.com/store/customer/product.php?
> productid=17241&cat=262&page=1
>
> you'll see that the 6.50-13 that Corky Coker is making is 24.58"
> diameter. We all know about variances in diameters and differences in
> construction, which result in different revs per mile, but this is
> essentially the same diameter as the Sears 185/80-13. It also matches
> the diameters of original replacement 6.50-13's, according to the
> documentation I have. Remember, Corky makes these tires from original
> molds. He doesn't tool these up according to his preferences.
>
> The belief that a 175/80-13 is a replacement for a 6.50-13 and a
> 185/80-13 is a replacement for a 7.00-13 is a popularly held one.
> Unfortunately is is inaccurate. The 185/80 is essentially a direct
> replacement, at least in regards to diameter, for a 6.50-13.
>
> Where then does this leave the person looking for a 7.00-13
> replacement? Out of luck, that's where. There simply isn't a 13" tire
> being manufactured today that is a real replacement for the 7.00-13.
> The best substitute is, again, the 185/80-13.
>
> Further, some will bring forth the 205/70-13 as the 7.00-13
> replacement. But, while this is an interesting tire, it is even smaller
> in diameter than the 185/80-13.
>
> Maybe someday CORSA will get serious about the acceptable tire sizes
> for Concours entrants. Probably only then, when there is a market for
> them, will Coker, or anyone else, reproduce the 7.00-13. Then all those
> "original" concours cars will have real "original" tires, like all
> other concours cars do instead of the silly sizes called for in the
> CORSA rules.
>
> Bruce
>
> PS
>
> Congratulations on being elected a new Director. Does this mean we'll
> see you at our "Corvairs in the Curves" autocross this Fall?
>
> On May 26, 2004, at 9:01 AM, Bill Hubbell wrote:
>
> > In the meantime, you can still buy new 13" tires from Sears:
> >
> > For 1960-64 Cars:
> > Guardsman Guardsman III - P175/80R13:
> > Sears item #09560842000
> > Mfr. model #112-801
> > http://tinyurl.com/2jz8k
> >
> > For 1965-69 Cars:
> > Guardsman Guardsman III - P185/80R13
> > Sears item #09560843000
> > Mfr. model #112-828
> > http://tinyurl.com/3ajt6
> >
> Bruce W, Schug
> CORSA South Carolina
> Greenville, SC
> bwschug@charter.net
>
> CORSA member since 1981
>
> '67 Monza. "67AC140"
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