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Old 03-22-2010, 01:18 AM   #1
jake wells
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wierd size spare tire on my 79

i pulled my spare off since i was getting new tires and it read Goodyear H7815 LT. can anyone tell what the size would be now it says the same on my door. the tire looks brand new but i had it replaced i did keep it though. the tires on it now are 235/7515 is that the right size? the old tire says steel belted bias i never heard of one.

shoot me something if anyone knows something
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Old 03-22-2010, 10:40 AM   #2
C10Silverado79
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Re: wierd size spare tire on my 79

I am no expert but a quick google came up with this Tire Size Conversion Chart If I'm reading the chart correctly, an H78/15 translates into a 225/75R15. Bias Ply was the tire design before Radials were developed. Looks like we are both showing our ages.

I have 235/75 15's on my truck also. They are a little taller I believe and may throw the speedo off a tad. I'm sure someone with more knowledge will correct anything that I have wrong.
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Old 03-22-2010, 10:44 AM   #3
old Rusty C10
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Re: wierd size spare tire on my 79

he is right.. they used to do letters.. i run 235 in the back to handle more weight and make the truck more stable and 225 up front
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Old 03-22-2010, 10:49 AM   #4
C10Silverado79
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Re: wierd size spare tire on my 79

I also just found this cool little Tire Size Calculator that will show you how a different tire size will effect your speedometer.
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Old 03-22-2010, 11:33 AM   #5
Restrorob
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Re: wierd size spare tire on my 79

Quote:
Originally Posted by C10Silverado79 View Post
I also just found this cool little Tire Size Calculator that will show you how a different tire size will effect your speedometer.

Now that's cool calculator, I was able to enter the sizes on my 97 and see why it sucks sooo much gas and how to calculate my speed since the speedo is off !

Now to see if I can find some tires close to stock height to get my mileage back up....
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Last edited by Restrorob; 03-22-2010 at 11:35 AM.
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