Tire size - Pontiac GTO Forum
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post #1 of 18 (permalink) Old 09-13-2013, 10:33 PM Thread Starter
 
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Tire size

Hi, I am picking up my car next tuesday (69judge clone) anyway, I was wondering abut tires. If they are crap and need to be replaced, I was wondering what other widths would work with the rally wheels. Something with a little more meat, but no rubbing issues works. I did it on a tire calculator, and 225 70 14 is pretty mch bang on diameter as the factory 215 75 14. Would 235 even fit on the rear or is 225 the biggest with no issues
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post #2 of 18 (permalink) Old 09-14-2013, 07:28 AM
 
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I have 14" Rally wheels as well. From my searching last fall the largest (widest) I could go was 225 on my 14" rims. (would liked to have gone a little wider)

You may have to go to a larger rim.
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post #3 of 18 (permalink) Old 09-14-2013, 04:28 PM Thread Starter
 
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After doing the wheel calculator there isn't a 235 made that is near equivelant to the diameter of the 215/75/14 tire. The 225 70 14 looks to be the safest bet for fitment and diameter. not much difference of width really to give any better traction though
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post #4 of 18 (permalink) Old 09-14-2013, 04:55 PM
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Here are the calculations on a 235mm tire with both 60 and 70 aspect ratios;


Tire width,

235 X .03937 = 9.25"

Aspect Ratio 60 series

9.25 X .60 = 5.55" sidewall height

Tire height

5.55 X 2 + 14" wheel size = 25.1"

Aspect Ratio 70 series

9.25 X .70 = 6.47" sidewall height

Tire height

6.47 X 2 + 14" wheel size = 26.9"

A 9.25" wide tire will work on our cars as long as the backspace is correct, the 60 series at 25.1" tall should not have rubbing issues and the 70 series may be too tall at 26.9"

The wheel width needs to be 6.5" to 8.5" wide, BFGoodrich has the TA radial in 235/60R-14

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post #5 of 18 (permalink) Old 09-14-2013, 06:32 PM Thread Starter
 
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too bad there is no 235 65 14. The 235 60 14 will be 6% off on the speedo....it will show 60mph when your going 56.4. That is significant
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post #6 of 18 (permalink) Old 09-15-2013, 05:32 AM
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I have 14x7 wheels

Running: 14x7 Rally II 245x60x14
They look great, wide and fit great in the wheel-wells

As far as speedo. TH 400...3.55 rear... Spot on up to about 58 mph then at 60 off by about 2mph. Am using the 45 tooth driven gear I think its the light blue one.

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post #7 of 18 (permalink) Old 09-15-2013, 02:37 PM
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Quote:
Originally Posted by Darth Menace View Post
too bad there is no 235 65 14. The 235 60 14 will be 6% off on the speedo....it will show 60mph when your going 56.4. That is significant
A 65 series would be a good fit,

Randy


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post #8 of 18 (permalink) Old 09-15-2013, 06:16 PM Thread Starter
 
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Originally Posted by GTO JUDGE View Post
I have 14x7 wheels

Running: 14x7 Rally II 245x60x14
They look great, wide and fit great in the wheel-wells

As far as speedo. TH 400...3.55 rear... Spot on up to about 58 mph then at 60 off by about 2mph. Am using the 45 tooth driven gear I think its the light blue one.
does the 245 tire bubble out a lot past the rim? Like look strange or no?
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post #9 of 18 (permalink) Old 09-15-2013, 06:57 PM
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Garage
Pick up some 15x7 rally II's off craigslist and you'll have an almost endless tire selection.
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post #10 of 18 (permalink) Old 09-19-2013, 11:36 AM Thread Starter
 
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thanks for the info guys. I got the car and the wheels/tires are crap. I am Canadian so I dont have the store/website options that you do unfortunately. I am thinking of getting these for it: Ridler Wheels - Style 675 Polished, Ridler Rims in Canada.

The tire will be 235, so I assume that is wide enough but not too wide to cause rubbing in the front?
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