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  #1  
Old November 29th, 2004, 11:17 PM
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Larry O'Hara
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Tire Sizes

Question for anyone who has played tire tech on a 90.

I have 5 new BFG 265/75/16's on my wagon now but . . .

I obtained 8 (New) - 235/85/16 Goodyears (US military used this size on assault 110's)

Not really familiar with tire size variations. I figure must be a bit wider but how much difference in height?

Pros/cons re size change?

Trying to determine whether to store for future use or sell to someone running the 235/85/16 size.

Thanks!
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  #2  
Old November 29th, 2004, 11:27 PM
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Abel Villesca
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You can do a comparison here: http://www.discounttire.com/dtc/broc...o/tireMath.jsp


Abel
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  #3  
Old November 29th, 2004, 11:32 PM
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Thanks for the link!

Not much difference in them it seems except 85s are a bit wider.
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  #4  
Old November 30th, 2004, 12:03 AM
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Abel Villesca
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That's what it looks like to me. You get a little bit more sidewall height and less section width. In performance rally we look for a narrower tire set up for snow and gravel. Perhaps that's what the US military folks were after.

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  #5  
Old November 30th, 2004, 10:44 AM
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John B.
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?????

265/75/16 is 31.7" high by 10.4" wide. 265mm wide.

235/85/16 is 31.7" high by 9.3" wide. 235mm wide.

Same height. The 265s are 30mm wider than the 235s. 235/85/16 is a common tire used on Defenders.
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  #6  
Old November 30th, 2004, 11:02 AM
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Thanks John,

Perhaps a poll of the most common size used by owners and experience with performance would be applicable here?
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  #7  
Old November 30th, 2004, 11:26 AM
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Quote:
Originally Posted by Kimos
Thanks John,

Perhaps a poll of the most common size used by owners and experience with performance would be applicable here?
Sounds good, what sizes do you want in the pole?
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  #8  
Old November 30th, 2004, 11:39 AM
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I would think staying to common standard sizes

But it might be applicable to just have users post what they are most satisfied with for common every day usage as would imagine some change to other sizes/types for some events.

I would imagine that most would be interested in overall performance re height and width changes.
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  #9  
Old December 1st, 2004, 12:22 PM
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OK, I see, (not concentrating here )


I remember now . . .

higher the "r" value the thinner they are. So 85s are not as wide. Was confused a bit.

All this being said, The MT's I have would not effect the height really at all. Would prob look more "military"
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Old December 1st, 2004, 12:57 PM
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Well, take 256 75 R16. 265 is the width of the tire in millimeters, 75 is the % of the width that represents the height of the tire between the rim and the ground, and 16 is the size of the rim. So to figure out the tires size:

One, divide the width by 25 265/25 = 10.6 inches
Two, multiply the width by the profile ratio 10.6 x 75% = 7.95
Three, take that number and multiply it by 2 and add it to the rim height. 7.95 x 2 + 16 = 31.9 inches high.

So ruffly a 265 75R16 is 32x10.5
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  #11  
Old December 1st, 2004, 01:51 PM
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Damn . . . no wonder he's the Master Chief
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  #12  
Old December 1st, 2004, 09:49 PM
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It's all personal preference. I like a narrower tire, you can always air down for a wider profile when off roading. A narrower tire will also allow you to get a bit tighter of a turning radius as you can adjust your steering stops to allow for additional rotation of the steering wheel. I run BFG muds 255 85/16. 33.3 x 10, fits nice with a modest lift.
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  #13  
Old December 1st, 2004, 11:53 PM
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Nice . . .

Another white wagon . . . .

Yes, I may try the change. Have 8 new 235x85 GY MT. If it were only 10

Greed . . .

Figures, plenty of tires but cant find decent side steps
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