63 Riviera; what was the stock tire size from the factory?

[39mm]

And what size do you use if not the stock size?

[71GS]

I run 215/75/15 on my 65. 

Generally considered close to original size. Hope that helps 

Brian

[telriv]

I have been using 225/70/15 for over 25 years now.

 

Tom T.

[39mm]

1 minute ago, telriv said:

I have been using 225/70/15 for over 25 years now.

 

Tom T.

How wide is too wide? Do you think that 235 is too wide?

[39mm]

44 minutes ago, 71GS said:

I run 215/75/15 on my 65. 

Generally considered close to original size. Hope that helps 

Brian

Thanks.

[Turbinator]

Stock size from factory is 7.10 15.

 

[Turbinator]

On 7/28/2021 at 10:29 PM, 39mm said:

And what size do you use if not the stock size?

225/70/15.

Edited August 8, 2021 by Turbinator (see edit history)

[RivNut]

7.10x15 was the standard size and those tires came on 5.5" rims. Today's equivalent size is 215/75R15.  The optional (extra cost) tire was the 7.60x15 which came on a 6" rim.  Today's equivalent size is 225/75R15.  You'll experience some front tire rub with 235 tires when turning lock to lock.  Remember that the same 225 tires in 70 series are going to have a snsmaller rolling diameter and will throw your speedometer off and more revolutions per mile will affect your gas mileage.  All tire sizes end in a 5 - 195, 205, 215, 225, 235, etc.  Aspect ratios end in either a 5 or a 0 - 45, 50, 55, 60, 65, 70, or 75.  There are tire size calculators on line that you can use to find different size tires that have the same rolling diameter.

[39mm]

Thanks for the answers.

[Turbinator]

39- here is a pic of a 7.10 R 15 American Classic radial bias look. Supposedly this tire is a Repro of the original. The 63 did not have a 6” wheel only 5 1/2” wide. Correction: The 63 Buick zRiviera did have 6” wide wheel as an OPTION. Stock size? Optional size? Don’t know. The expert’s spec sheet could offer a guide what the stock tire may be. Could be open to interpretation.?

 

Edited August 23, 2021 by Turbinator (see edit history)

[RivNut]

The 63 DID come with 6” wheels if you ordered the optional 7.60 x 15 tires.  The 7.60 tires were code numbers T4 and T5 on the order sheet, depending on whether you wanted white sidewall or black sidewall tires. 
 

If you ordered the cast option aluminum wheel cover, the length of the shoulder on the securing stud was 1/4” longer for the 6” wheel. (1/4” made up one-half of the 1/2” difference in the width of the wheels.)

[Turbinator]

22 hours ago, RivNut said:

The 63 DID come with 6” wheels if you ordered the optional 7.60 x 15 tires.  The 7.60 tires were code numbers T4 and T5 on the order sheet, depending on whether you wanted white sidewall or black sidewall tires. 
 

If you ordered the cast option aluminum wheel cover, the length of the shoulder on the securing stud was 1/4” longer for the 6” wheel. (1/4” made up one-half of the 1/2” difference in the width of the wheels.)

 

The 63 DID come with 6” wheels if you ordered the optional 7.60 x 15 tires.

 

Ed, I’ll buy the 6” wheels were available- my mistake. Your statement “ 63 DID come with” is generally accepted standard fitting. The 63 DID not come with 6” tire car off the assembly line. The word optional means a choice and not standard issue car ordering/purchasing.

[RivNut]

But you said "only 51/2"." Meaning there was no 6" wheel available even as an option.

[Turbinator]

On 8/21/2021 at 10:47 AM, RivNut said:

But you said "only 51/2"." Meaning there was no 6" wheel available even as an option.

Ed, I’m surprised if I said 5 1/2” ONLY. What I did do is answer 39mm question.

Turbinator