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Old 03-29-2012, 04:06 AM   #1
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ST235/80R16 - does this fit?

I've found several ST tires in the 235/80R 16 size. Load capacity is 3000lb at 65PSI - each tire can carry more than the whole axel is rated for. Will the 235/80 fit in my wheel well? Axels are in good shape.
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Old 03-29-2012, 06:31 AM   #2
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225/75R16 will fit, though you may have to trim a bit off one end of the wheelwell. That is, of course, if your axles are in good shape.
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Old 03-29-2012, 06:36 AM   #3
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i found this:
St225 75-r15 on etrailer.com Search
St235-80r16 on etrailer.com Search
height - 28.4=15" vs. 30.9" 16" diameter
width - 8.9 15" vs. 9.4 16"
it depends on how much room you have in your wheel well.
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Old 03-29-2012, 04:43 PM   #4
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Thanks for the replys. I'm not a tire expert and I'm not sure if 235 vs 225 or 75 vs 80 are big enough differences to have an important effect on fit.
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Old 03-29-2012, 06:11 PM   #5
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I'll try to explain it in layman's terms.
The 85 and 75 are what is called aspect ratio, which is the proportion of width to height.
The 225 and 235 are total figures of the tire in millimeters.
In the real world, a 235 85 16 is taller and narrower than a 225 75 16 by two sizes. One size for the aspect ratio, and one size for the total size. So, the 235 is one size taller, but one size narrower, which makes the 2x difference. To get the same height, you would need a 245 75 16 tire. Or a 215 85 16 tire.
Clear as mud...
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Old 03-29-2012, 08:30 PM   #6
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A 235 is 10 millimeters WIDER than a 225 in it's tread width, not narrower.
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Old 03-29-2012, 08:34 PM   #7
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Originally Posted by dznf0g View Post
A 235 is 10 millimeters WIDER than a 225 in it's tread width, not narrower.
The aspect ratio is the width. 75 is wider than 85, as that is the percentage of width to height.
A 235 50 15 is really wide and low, while a 235 85 15 is tall and narrow.
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Old 03-29-2012, 08:40 PM   #8
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You have it backwards. 225 75R 16 is 225 mm wide and 75% as tall from the bead to tread as it is wide.
So a 235 80R 16 is 10 mm wider and 80% as tall as it is wide. Therefore it is "two sizes" larger because it is a larger percentage of a larger width number.

a 225 80R 16 is "one size bigger" because it is the same width but a larger height to width percentage.
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Old 03-29-2012, 08:41 PM   #9
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Aspect ratio is just that...a ratio of height divided by width.
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Old 03-29-2012, 08:45 PM   #10
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Quote:
Originally Posted by overlander63 View Post
The aspect ratio is the width. 75 is wider than 85, as that is the percentage of width to height.
A 235 50 15 is really wide and low, while a 235 85 15 is tall and narrow.
They are the SAME width....235mm. one is 50% in height as compared to width. The other is 85% in height as compared to width. So yes, the 85 is taller, but not wider.

It is a percentage of height to width not width to height.
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Old 03-29-2012, 09:43 PM   #11
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To answer OPs question...on my 2 axle Classic when I went from 225 75R15 to 225 75R16 (same width and sidewall height, but 1" larger overall diameter, due to rim size increase) I am as close to the lower corner of the wheel well molding as I am comfortable with.

Basically you are going "two sizes" bigger than I did, with the same wheel diameter. If it will fit up under the well (due to width), it will be very close to the lower corners of the well molding. I'd be worried. Can you trial fit prior to purchase?
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Old 03-30-2012, 06:43 PM   #12
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Quote:
Originally Posted by dznf0g View Post
To answer OPs question...on my 2 axle Classic when I went from 225 75R15 to 225 75R16 (same width and sidewall height, but 1" larger overall diameter, due to rim size increase) I am as close to the lower corner of the wheel well molding as I am comfortable with.

Basically you are going "two sizes" bigger than I did, with the same wheel diameter. If it will fit up under the well (due to width), it will be very close to the lower corners of the well molding. I'd be worried. Can you trial fit prior to purchase?
I wish I could trial fit but I'd have to buy the rim tire to do that. Found some nice 16" wheels aluminum, for $89 on sale. 225 75 16 tires are available but are between 250 - 300 dollars each. 235 80 16 are about 149 each but sounds like its a tire too large.
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Old 03-30-2012, 06:50 PM   #13
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That's a big tire, 2.5" larger than stock in diameter, and wider.

I'm not sure why you would want to use it, especially on a 34' where the load on each tire is quite low.
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Old 03-30-2012, 08:54 PM   #14
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Originally Posted by Jammer View Post
That's a big tire, 2.5" larger than stock in diameter, and wider.

I'm not sure why you would want to use it, especially on a 34' where the load on each tire is quite low.
I'd prefer the 225 75 16 but they are almost 2x the cost. Looks like I cough up the $$ for the correct size or stick w/ 15s.
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