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%
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