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There are 5 messages in this issue.
Topics in this digest:
1. Re: Tire Math
From: "RON KURTZ" <Mark268@xxxxxxxxxxxxxxxx>
2. RE: Tire Math
From: George McKovich <george@xxxxxxxxxxxxx>
3. Re: Tire Math
From: dan300f@xxxxxxx
4. Re: Tire Math
From: News4ge@xxxxxxx
5. Re: Tire Math
From: dan300f@xxxxxxx
________________________________________________________________________
________________________________________________________________________
Message: 1
Date: Thu, 13 Dec 2001 20:03:47 -0800
From: "RON KURTZ" <Mark268@xxxxxxxxxxxxxxxx>
Subject: Re: Tire Math
Hello, everyone:
I recall someone had a link to a site that did tire size comparisons. I
saw
this on the list server about a year ago. It's a real handy tool. Maybe
they
can share it with us once again.
According to my tables, 205/75R14s are very close to G78x14s. You can go
to
a 215/70R14 without having too much effect on the speedometer (but watch
turning clearance in the front wheel wells).
14x6 rim sizes are typically recommended for 205s and 14x6.5 sizes are
recommended for 215s for optimum tire handling performance. However, on
Chrysler stock rims, I believe a 14x6.5 has a different bolt pattern than
the 14x6s. If you want to use the 14x6.5 rims, be sure to check the bolt
pattern (The distance between every other hole on the rim.)
It's been a while since I played with this. Maybe someone out there would
like to correct or add to this.
Best regards,
Ron Kurtz
E#292
A very happy holiday to all!
----- Original Message -----
From: Terry & Emily Lynch <terrytown@xxxxxxxxxxxxxx>
To: 62-65 Mopar List <1962to1965mopars@xxxxxxxxxx>; 300 List Posts
<Chrysler300@xxxxxxxxxxxxxxx>
Sent: Thursday, December 13, 2001 1:21 PM
Subject: [Chrysler300] Tire Math
> Hi All,
>
> It's time for a new set of tires on my '64 300 Sport. The service manual
says that the wheels are 14x6K and that they take a 8.00-14 size tire. But
I
noticed that the same year New Yorker uses the same wheel (14x6K) and
takes
a 8.50-14 tire. What's the difference? The car currently has G78-14 bias
ply
tires on it from the previous owner. I don't have a clue if those are the
right size. I called some local tire stores and they couldn't agree on
weather I needed a 215/75R14 or a 225/75R14. What's the difference there?
I
guess I'm just 'under-educated' when it comes to tires and sizes.
>
> I guess the other question that I'm looking for opinions on is if I
should
stay with bias ply tires for originality or use radial ones for better
ride.
I assume the radials handle better and are safer. Is that the case? I do
drive the car a bit, it's more of a driver than a show car. Is there any
drawback to radials, other than not being bone stock?
>
> Thanks for your advise & help,
>
> Terry Lynch
> '64 300 Sport convertible
> St. Petersburg, FL (Still waiting for the temps to get out of the 80's
so
the holiday spirit will hit!)
>
>
> [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
>
> 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/
>
>
>
________________________________________________________________________
________________________________________________________________________
Message: 2
Date: Thu, 13 Dec 2001 19:09:43 -0700
From: George McKovich <george@xxxxxxxxxxxxx>
Subject: RE: Tire Math
Ron and 300 Group....
I think this may be the web page you were referring to:
http://secret-secret.com/turbo/DIY/tirecalc/turbotire.html
Good luck,
George
----------
From: RON KURTZ
Sent: Thursday, December 13, 2001 9:03 PM
To: 62-65 Mopar List; 300 List Posts; Terry & Emily Lynch
Subject: Re: [Chrysler300] Tire Math
Hello, everyone:
I recall someone had a link to a site that did tire size comparisons. I
saw
this on the list server about a year ago. It's a real handy tool. Maybe
they
can share it with us once again.
According to my tables, 205/75R14s are very close to G78x14s. You can go
to
a 215/70R14 without having too much effect on the speedometer (but watch
turning clearance in the front wheel wells).
14x6 rim sizes are typically recommended for 205s and 14x6.5 sizes are
recommended for 215s for optimum tire handling performance. However, on
Chrysler stock rims, I believe a 14x6.5 has a different bolt pattern than
the 14x6s. If you want to use the 14x6.5 rims, be sure to check the bolt
pattern (The distance between every other hole on the rim.)
It's been a while since I played with this. Maybe someone out there would
like to correct or add to this.
Best regards,
Ron Kurtz
E#292
A very happy holiday to all!
----- Original Message -----
From: Terry & Emily Lynch <terrytown@xxxxxxxxxxxxxx>
To: 62-65 Mopar List <1962to1965mopars@xxxxxxxxxx>; 300 List Posts
<Chrysler300@xxxxxxxxxxxxxxx>
Sent: Thursday, December 13, 2001 1:21 PM
Subject: [Chrysler300] Tire Math
> Hi All,
>
> It's time for a new set of tires on my '64 300 Sport. The service manual
says that the wheels are 14x6K and that they take a 8.00-14 size tire. But
I
noticed that the same year New Yorker uses the same wheel (14x6K) and
takes
a 8.50-14 tire. What's the difference? The car currently has G78-14 bias
ply
tires on it from the previous owner. I don't have a clue if those are the
right size. I called some local tire stores and they couldn't agree on
weather I needed a 215/75R14 or a 225/75R14. What's the difference there?
I
guess I'm just 'under-educated' when it comes to tires and sizes.
>
> I guess the other question that I'm looking for opinions on is if I
should
stay with bias ply tires for originality or use radial ones for better
ride.
I assume the radials handle better and are safer. Is that the case? I do
drive the car a bit, it's more of a driver than a show car. Is there any
drawback to radials, other than not being bone stock?
>
> Thanks for your advise & help,
>
> Terry Lynch
> '64 300 Sport convertible
> St. Petersburg, FL (Still waiting for the temps to get out of the 80's
so
the holiday spirit will hit!)
>
>
> [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
>
> 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/
>
>
>
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
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/
[Non-text portions of this message have been removed]
________________________________________________________________________
________________________________________________________________________
Message: 3
Date: Thu, 13 Dec 2001 21:30:37 EST
From: dan300f@xxxxxxx
Subject: Re: Tire Math
Hi all:
The formula for calculating the diameter of a radial tire is as follows:
For example, a 235/75R15
Where: 235 equals the tire width in millimeters
75 is the height of the sidewall as a percentage of tire
width
15 is the diameter of the rim in inches
First, converting tire width to inches:
235 mm divided by 25.4 mm/in. = 9.25 in.
Then multiply 9.25 in. by .75 (the 75 in the tire size) = 6.94 in.
(This is the sidewall height)
Then multiply this number by 2 (the tire sidewall height times 2)
= 13.88 in.
Add in the diameter of the rim, 15 in. + 13.88 = 28.88 in.
(the diameter of the tire.)
Have fun.
Dan Reitz
Northridge, CA
[Non-text portions of this message have been removed]
________________________________________________________________________
________________________________________________________________________
Message: 4
Date: Thu, 13 Dec 2001 22:05:59 EST
From: News4ge@xxxxxxx
Subject: Re: Tire Math
Radials seem to ride lower than bias ply. They always look like they're
under-inflated. Does this have an effect on car height? Should it be
factored in when figuring what size in today's terms would match an old
7.60/15 or an 8.50/14, etc.? Would it affect the speedometer, or do
radials
"grow" at highway speeds, like the slicks on a top fueler? Dumb
questions?
George Clineman
________________________________________________________________________
________________________________________________________________________
Message: 5
Date: Thu, 13 Dec 2001 22:14:46 EST
From: dan300f@xxxxxxx
Subject: Re: Tire Math
For what it is worth concerning bias vs radials:
I replaced my 900x14 bias plys with 235/75R15 radials when I went to disk
brakes on my F. I selected the 235's because the math showed them to be
virtually the same diameter as the bias ply's. On a trip to Phoenix last
January, I measured my odometer reading for a 10 mile stretch of mile
markers. The reading was within 1% of the reading I got on the same
stretch
the previous year with the bias plys.
Dan Reitz
Northridge, CA
[Non-text portions of this message have been removed]
________________________________________________________________________
________________________________________________________________________
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