Bill, I believe 82 is closer to being correct. I always thought it was
85. Bit 100 sounds too far out.
Larry
On Sep 9, 2003, at 8:37 AM, William M. Gilroy wrote:
> William M. Gilroy wrote:
>
> Below is a message I received from Phil. The question to the list is
> he
> correct? I just assumed that that the profile size was 100. Anyone
> care to shed any light on the issue? Also at the bottom is a new table
> of sizes and the original from my first post, there is a large
> difference. Which is correct?
>
> Bill Gilroy
>
> ------ Phil Profili's message Phil.Profili@cptii.com
> <mailto:Phil.Profili@cptii.com> ---------------------
>
> Bill,
>
> Are you sure that the originals are really 100 profile? I always
> thought that the "SR" labeled tyres were 82 profile which, if true,
> throws your numbers out a little.
>
> I think the 165/70 is the closest in size to the originals, if I'm
> correct on the 82 profile thing.
>
> The only comment I would make is that if you have square wheel arches
> (which you probably do, if yours is a stock '77), you may encounter
> some rubbing with anything over a 165 width tyre. The 1500s sit
> higher, so you may be OK. I have 175/60s on mine and I fitted a
> Panhard Bar to get around the rubbing. My car is very low, so it
> sometimes still rubs, depending on who I have in the passenger seat
> (!). I will be converting it to round wheel arches some time in the
> near future, partly to get around the problem for good and partly
> because I like the look.
>
> Phil
>
> -------- End message --------------------
>
> There is a large difference. Her are the new numbers:
>
> *New Tire Size Comparison w/ 82 profile*
>
> Specification Sidewall Radius Diameter Circumference Revs/Mile
> Difference
> 145/82-13 4.7in 11.2in 22.4in 70.3in 902
> 0.0%
> 155/82-13 5.0in 11.5in 23.0in 72.3in 877
> 2.9%
> 155/80-13 4.9in 11.4in 22.8in 71.5in 886
> 1.8%
> 165/65-13 4.2in 10.7in 21.4in 67.4in 940
> -4.1%
> 165/70-13 4.5in 11.0in 22.1in 69.4in 913
> -1.2%
> 175/60-13 4.1in 10.6in 21.3in 66.8in 948
> -4.9%
> 175/70-13 4.8in 11.3in 22.6in 71.1in 891
> 1.3%
> 185/55-13 4.0in 10.5in 21.0in 66.0in 960
> -6.0%
> 185/60-13 4.4in 10.9in 21.7in 68.3in 928
> -2.8%
>
> Now here are the old one:
>
> *Original Tire Size Comparison w/ 100 profile*
>
> Specification Sidewall Radius Diameter Circumference Revs/Mile
> Difference
> 145/100-13 5.7in 12.2in 24.4in 76.7in 826
> 0.0%
> 155/100-13 6.1in 12.6in 25.2in 79.2in 800
> 3.2%
> 155/80-13 4.9in 11.4in 22.8in 71.5in 886
> -6.8%
> 165/65-13 4.2in 10.7in 21.4in 67.4in 940
> -12.2%
> 165/70-13 4.5in 11.0in 22.1in 69.4in 913
> -9.5%
> 175/60-13 4.1in 10.6in 21.3in 66.8in 948
> -12.9%
> 175/70-13 4.8in 11.3in 22.6in 71.1in 891
> -7.3%
> 185/55-13 4.0in 10.5in 21.0in 66.0in 960
> -13.9%
> 185/60-13 4.4in 10.9in 21.7in 68.3in 928
> -11.0%
>
--
Larry B. Macy, Ph.D.
macy@bbl.med.upenn.edu
System Administrator/Manager
Neuropsychiatry Section
Department of Psychiatry
University of Pennsylvania
3400 Spruce St. - 1015 Gates
Philadelphia, PA 19104
I have great faith in fools - my friends call it self-confidence.
- Edgar Allen Poe
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