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  #21  
Old 02-11-2011, 08:53 PM
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Anders
The tire profile whether it be 50, 60, 70, 75, is a direct proportion to the tread width that's why a 205/75 has a smaller diameter than a 215/75.
I have 225/70/14 silvertown's on my black 60, see post towards the top, the diameter is obviously wrong as my speedo is a little out. This doesn't worry me as I use a GPS speedo in all my cars and read in Km/h

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Old 02-11-2011, 09:52 PM
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Yeah, But if we leave the 205 out and just look at 215/75, ther e is different diameters.
My ól Road King: 26.25
American Classic: 26.69
Cooker: 27.11
I just wonder wich one is closest to the original from the factory, as they seems to be quite different...?
Your BF Goodrich Silvertown is 26.30, but don´t that tire require a wider rim?
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Last edited by Anders : 02-11-2011 at 09:55 PM.
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  #23  
Old 02-11-2011, 10:09 PM
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Hey Anders
Take a look at this
http://clubs.hemmings.com/clubsites/...conversion.htm

Acording to the OFS 8.00 x 14 was std 8.50 x 14 was optional for '58

Richard
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  #24  
Old 02-13-2011, 10:23 PM
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You can get the diameter for any modern tire size pretty eaisy. Lets take the 225/75R14:

225 = The section width in mm

75 = Aspect ratio, in this case the side wall is 75% as tall as the section width. So, 225mm x .75 = 168.75mm

R = Radial

14 = Wheel diameter in inches.

So, there are 2 side walls, one up top and one at the bottom. 168.75 x 2 = 337.5mm.

Next, we need to convert that to inches. 337.5mm / 25.4mm per inch = 13.287 inches.

Add that to the 14 inch wheel diameter and you get 27.287 inches.

That said, for reasons I'm not sure of, tires of different brands in the same size have slightly different outside diameters. Also, the outside diameter will vary depending on the width of the wheel it's installed on.

Also, if you go to Coker's web site and look up the bias ply 800-14 and 850-14, you'll find the heights listed there. The 800 was 27.58" tall and the 850 was 28.10" tall. That's the only source I've found for heights of the originals.

When I bought my rims & tires, I wanted to get as close to the original diameter as practical so they'd fill the wheel wells. My 235/55R17's are 27.18" tall, theoretically, which is pretty close in my book to the 800's anyway.

Hope that helps.
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Old 02-14-2011, 01:50 PM
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Thanks alot.
Yes, I was looking for the same ( original diameter ).
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Old 02-15-2011, 03:06 PM
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Default Whitewall Tires

Thanks for that information, Doug! I added it to the Technical Resource Library. You will find it under the Tires picture.
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Last edited by YellowRose : 02-15-2011 at 05:54 PM. Reason: Corrected location of post
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  #27  
Old 02-15-2011, 04:33 PM
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Take a look at similar thread for a while back. Another reason it's been suggested to buy tires in pairs, you could end up with different size tires if you bought the same sizes from different manufacturers.

http://squarebirds.org/vbulletin/showthread.php?t=4354
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  #28  
Old 02-17-2011, 04:36 PM
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Ordered 5 Coker P215 /75 R14 today
Thank´s for all tips and efforts guys
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