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Old 04-18-2014, 02:53 PM
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33 duratrac tire size discrepancy

Before I get grief for starting another tire thread (yes I’ve used the search function, plenty of times), read the whole post.

Waiting on my new JKU. I’m set on the 2.5 AEV lift and 33 inch duratracs. I’m struggling between 33 x 12.5 x 15 or 285 70 r17. I realize the pros/cons of 15 vs 17 wheels, tire load ratings, wheel width, cost, etc. I’m confused about the discrepancy on the actual tire size between websites. I realize that I’ll yield less than 33 inches in height when mounted in the real world. I also realize that the wider tire may appear “bigger”. At the end of the day when mounted, will one or the other physically be taller than the other?

For actual tire sizes

33 x 12.5 x 15
Goodyear website shows 32.8 outside diameter and 12.5 section width
Walmart shows 32.5 x 12.5 in the product specifications
Tirerack matches Walmart
Not specified on discount tire

285 x 70 r17
Goodyear website shows 33 outside diameter and 11.5 section width
Walmart shows 32.8 x 11.5
Tirerack matches walmart
Not specified on discount tire

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Old 04-18-2014, 03:48 PM   #2
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I can't speak as to why there is a discrepancy between the tire size specs between the websites. If you click on the heading under the specs section on tire rack, it explains the procedure they use to determine overall tire diameter.

To answer your question on which one is taller, all web sites are showing the 285/70R17 (33 or 32.8" diameter) to be either .20 or .30" larger in overall diameter than the 33 x 12.5 x 15's (32.8 or 32.5" diameter). With a difference that small, I would make my selection based on the wheel diameter or tire width you prefer as those dimension differences are much more discernible.

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Old 04-18-2014, 04:11 PM   #3
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They are so close, that it doesn't really matter. The performance will be excellent on either, or!
If your also looking at appearance, then the 17 inch wheel, just seems to look better dimensionally, on a JK. But that is just my opinion, some others will agree, and some won't. On the TJs, I like the 15s.
That is why, it is called a choice, (and it is your choice, and not ours). There is no right, or wrong, but rather what you prefer...........

I will recommend, that you go down in the Picture Section of the Forum, and you will see 15s, 16s, 17s, and 18s. This will also give you a better idea, as to what they would look like on your Wrangler. Take your time, and make the correct choice, the first time........
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Old 04-18-2014, 04:22 PM   #4
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Skip the 33 and go for the 35!
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Old 04-18-2014, 04:38 PM   #5
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The difference in size is less than you'll wear down in tread.
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Old 04-18-2014, 09:17 PM   #6
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get the 35s, they only measure 34 and change anyway and ull be regretting it later
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Old 04-18-2014, 10:56 PM   #7
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Well a 285/70-17 is not a 33" not sold or advertised as a 33. It is a 285/70-17. X
Now between the 2 height wise will not even be noticeable,, bit the width is,
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Old 04-20-2014, 04:00 AM   #8
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When in doubt go to the source; the manufacturer. None of vendors matter.
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Old 04-20-2014, 07:28 AM
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I appreciate all of the advice. It's common sense but I'm overthinking things to occupy my jeep thoughts while waiting on my build. I got to a point where I was unsure, or what we call in my field of work "analysis paralysis".
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Old 04-20-2014, 09:43 AM   #10
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33x12.50-15 gets my vote.
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Old 04-20-2014, 09:56 AM   #11
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The 33x12.5x15 measures 32.8 when not under load (spare) on my JKU Sport, the four that are in use measure 32.4. Here's a pic for reference...
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Old 04-20-2014, 10:14 AM   #12
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I vote either the 33/12.5 or the 315/xx(35/12.5) as said before the size difference is so tiny you won't notice it but you will notice the wider width between 285mm and 12.5in. If a jeep had any cornering ability you'd be able to tell the difference between a 15" and a 17" Rim due to the tire roll but the jeep can't corner well enough to notice so by getting a smaller rim you can save money on tires and prevent curb rash
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Old 04-20-2014, 11:06 AM
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Quote:
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The 33x12.5x15 measures 32.8 when not under load (spare) on my JKU Sport, the four that are in use measure 32.4. Here's a pic for reference...
That's what I'm leaning towards at the moment. Any issues hydroplaning in wet weather with the wide tire? Or is the difference between 11.5 and 12.5 so small they perform the same in wet weather? Currently running 10.5 on my tj.

Love your look. You might have a clone very soon.
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Old 04-20-2014, 11:37 AM   #14
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Quote:
Originally Posted by Phase2 View Post
The 33x12.5x15 measures 32.8 when not under load (spare) on my JKU Sport, the four that are in use measure 32.4. Here's a pic for reference...
What brand wheels are those?
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Old 04-20-2014, 11:56 AM   #15
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Go for the 285, as others have said the height difference won't matter but skinnier tires get more traction in all but deep snow and deep mud ( where the bottom is higher than the axles)
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Old 04-20-2014, 01:11 PM   #16
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The 33x12.5x15 measures 32.8 when not under load (spare) on my JKU Sport, the four that are in use measure 32.4. Here's a pic for reference...
What wheels do you have there on your Jeep? Really like the look you have.

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Old 04-20-2014, 04:40 PM   #17
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What wheels do you have there on your Jeep? Really like the look you have. Carl
Thanks! They're Level 8 Trackers (15") - got them from Discount Tire Direct.
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Old 04-20-2014, 04:42 PM   #18
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Quote:
Originally Posted by tnjeeper83 View Post
That's what I'm leaning towards at the moment. Any issues hydroplaning in wet weather with the wide tire? Or is the difference between 11.5 and 12.5 so small they perform the same in wet weather? Currently running 10.5 on my tj. Love your look. You might have a clone very soon.
No issues at all. The tread is so deep on the tires, I can't imagine hydro planing in nearly any condition.

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