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Discussion Starter · #1 ·
this whole tires size thing is still throwing me for a loop.
the guys at discount tires told me my new tires(70/17) would fit my stock rims for now and the new rims once i get them. Ther rims im buying are 9 inches wide. I dont know the wide of the stock rim but the tire on there right now is 285/75/17 and the tires im getting put on are 70/17. is there going to be any issues?
 

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285/75/17 is approximately 11.22" wide x 33.83" tall. The 285/70/17 is going to measure 11.22" wide x 32.708" tall. The tires that you are getting are going to be 1.122" smaller (height). Hope this helps...
 

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Discussion Starter · #3 ·
285/75/17 is approximately 11.22" wide x 33.83" tall. The 285/70/17 is going to measure 11.22" wide x 32.708" tall. The tires that you are getting are going to be 1.122" smaller (height). Hope this helps...
helps a little bit, im wondering if the new tires im going to be getting that are 17x9 are going to fit that. I guess im confused on the difference bt the 70/75
 

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The 70 and 75 in the two tires are the ratio of the width of the tire to its height. In other words 70% as tall as it is wide, and 75% as tall as it is wide. The first number (285) is millimeters. Convert that number to inches to get the width of the tread. Then the 70 is the percent of the width that the tire is high (from mounting point on the wheel to the tread, not the overall diameter of the outside of the tire).

So, the 285 is 11.22 inches wide, and 75% of that is 8.4 inches from mounting point on rim to the "top" of the tire. And it mounts on a 17 inch rim.
 

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The 70 and 75 in the two tires are the ratio of the width of the tire to its height. In other words 70% as tall as it is wide, and 75% as tall as it is wide. The first number (285) is millimeters. Convert that number to inches to get the width of the tread. Then the 70 is the percent of the width that the tire is high (from mounting point on the wheel to the tread, not the overall diameter of the outside of the tire).

So, the 285 is 11.22 inches wide, and 75% of that is 8.4 inches from mounting point on rim to the "top" of the tire. And it mounts on a 17 inch rim.
yes. What he said. To take what he said perhaps one step further, the 285 as he said is millimeters. The 70 or 75 is the the percentage of the width. When converted to english units you multiply that times two. That being the top and bottom and then add the rim diameter.

Example: 285(metric) ÷ 25.4=11.22 that is the width of the tire in standard units
Take 11.22 x .75=8.415. Multiply that by 2(top and bottom) you get 16.83. Add the rim diameter of 17 and you get a tire that is 33.83 inches tall

To figure the 70 series tire substitute .7 inplace of the .75 and you would get a tire height of 32.68 inches
 

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OMG! This needs to be a friggen STICKY!!!!!!!!!

I knew first number was width, second number was rubber length off rim (hight I guess), and third was rim, but WHOA, figuring out a mathmatical equation is amazazing!
 

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This tire is also about 3% smaller so your speedo will be out about 2 mph at 60mph
 

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Discussion Starter · #8 ·
Went with 295/70/17 :) posting pics tomorrow
 

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Nitto's site has some video's to explain the tire marking, size etc.

They actually aren't too bad.
 

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Discussion Starter · #10 ·
Nitto's site has some video's to explain the tire marking, size etc.

They actually aren't too bad.
i went on their website and found where they show the inches of each tire and show which rims they could fit. really helped me
 

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