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Old 02-23-2013, 11:13 AM   #1
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Performance ? - 35's vs 34's

My Jeep: 2013 Rubi 2-door, 6-speed.

Two tires I'm looking at....Toyo AT II's 285/75/70 (34" tires) and Goodyear Duratrac 315/70/17 (35" tires). What I've found online, the Toyo's weigh 63 lbs and the Duratrac's weigh 60 lbs. They are both close in weight and in size.

I don't want to lose any more power than what I'm already getting from my stock setup, though I know I will lose some by going to bigger tires. I'm just wondering which tire would cause the biggest hit?

The 285/75 sidewall height is 8.42".
The 315/70 sidewall shows 8.68"

285/75 diameter is 33.83"
315/70 diameter is 34.36"

The Duratrac weighs a little less (by 3lbs), but it's a little bigger. Am I really gonna be able to tell a difference between the two other than looks?

Power/Torque/Gas mileage are big deals for me since I drive 100 miles per day. Highway traffic around me is murder if you dive a slug.

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Old 02-23-2013, 11:28 AM   #2
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I think the mpgs and power loss will be hard to tell apart.

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Old 02-23-2013, 11:30 AM   #3
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The dura trac is a great mall crawler tire it's light for a reason thin sidewalls if you plan on going off road look at a heavier 3ply sidewall tire.
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Old 02-23-2013, 11:36 AM   #4
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315/75R16 Duratracs are 3 ply sidewall. I have a set of five sitting in my garage. Waiting impatiently for my lift to arrive....
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Old 02-23-2013, 11:38 AM   #5
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I'm only off the road during hunting season and only on weekends, but the dirt roads I'm on here in Texas are just as I say....dirt roads. Very rarely do I see rocks.....mostly mud (if and when it rains).

So I want tires that have good tread for the mud and I want them to be tall so I get clearance when going through ruts, but since I drive so far, I really need the best mileage I can get.

And I know....if I want good mileage, don't change a thing and in reality, I shouldn't have bought a Jeep.
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Old 02-23-2013, 11:51 AM   #6
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You'll be fine either way.

You've got a lightweight 2 door with 4.10 gears, the ability to determine your own shift points, and powered by a 3.6.

Of the stock jeeps available, yours is best suited to the task. 3 pounds this way or that just isn't going to matter.
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Old 02-23-2013, 11:55 AM   #7
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Quote:
Originally Posted by MTH
You'll be fine either way.

You've got a lightweight 2 door with 4.10 gears, the ability to determine your own shift points, and powered by a 3.6.

Of the stock jeeps available, yours is best suited to the task. 3 pounds this way or that just isn't going to matter.
And there shouldn't be a difference with how the spare tire carrier handles it either, right? I've read when you go to 35's, you should think about changing out the factory tire carrier. I think it's a weight issue....since both tires weigh bout the same, I "should" think about going aftermarket.
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Old 02-23-2013, 11:59 AM   #8
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Quote:
Originally Posted by bfschor

And there shouldn't be a difference with how the spare tire carrier handles it either, right? I've read when you go to 35's, you should think about changing out the factory tire carrier. I think it's a weight issue....since both tires weigh bout the same, I "should" think about going aftermarket.
I would swap out the tire carrier, yes. That's part of the cost of going to anything over 33" in my opinion.

Some don't and matters seem okay . . . but I think, eventually, it'll have problems. Sooner rather than later of you bounce around offroad.
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Old 02-23-2013, 12:18 PM   #9
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The 315/70/17 Duratracs you're looking at are not a true 35" tire. Mine measure just 33.625" under load (30psi).

They also do perfectly fine off-road. Will they hold up against sharp rocks as well as Kevlar MTR's? No. But, there are plenty of people who wheel them all the time without issues... and they are practically unbeatable in the snow!

For a carrier, just grab the new Teraflex Adjustable Carrier, and you'll be all set...
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Old 02-23-2013, 01:13 PM   #10
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285/75/17 = 33" tire. Under load it's around 31-32"
315/75/17 = 35" tire. Under load it's around 33.5"

Skip the 33s and get the 35s.
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Old 02-23-2013, 01:20 PM   #11
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Quote:
Originally Posted by ESP
285/75/17 = 33" tire. Under load it's around 31-32"
315/75/17 = 35" tire. Under load it's around 33.5"

Skip the 33s and get the 35s.
285/75/17 = closer to 34"
285/70/17 = closer to 33"
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Old 02-23-2013, 01:25 PM   #12
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I just ordered a set of the Kevlar MTR in a 355 (digging the thread) waiting for install but got all 5 from 1800 installed with road hazard.
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Old 02-23-2013, 01:28 PM   #13
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Quote:
Originally Posted by Jammers View Post
285/75/17 = closer to 34"
285/70/17 = closer to 33"
285 is still a 33" tire at the end of the day either way you slice it 70 or 75.
315 is a 35" and will be taller mounted or un mounted.
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Old 02-23-2013, 01:35 PM   #14
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Quote:
Originally Posted by ESP

285 is still a 33" tire at the end of the day either way you slice it 70 or 75.
315 is a 35" and will be taller mounted or un mounted.
Not by the math. 75 has a 5% larger sidewall than the 70.
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Old 02-23-2013, 01:39 PM   #15
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Quote:
Originally Posted by Jammers

Not by the math. 75 has a 5% larger sidewall than the 70.
75's = 33.8" (closer to 34")
70's = 32.7" (closer to 33")
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Old 02-23-2013, 01:40 PM   #16
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Under load, 75's are usually about 0.2" taller than 70's.

If you have the lift to handle it, just get the Duratrac 315's and never look back. If you're dying for that extra 0.2", then get the 315/75/16" version instead of the 17" version...
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Old 02-23-2013, 01:41 PM   #17
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Not by the math. 75 has a 5% larger sidewall than the 70.
I understand that. The real world difference between a tire with 70 or 75 is fractions of an inch. Barely noticeable and mostly in distinguishable. The 70 is a bit wider, the 75 is a bit narrower and taller.

A 315 is taller than either variant. My recommendation is to skip the fractions in height and go for the tallest tire option here asked by the OP.
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Old 02-23-2013, 01:49 PM   #18
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Quote:
Originally Posted by ESP

I understand that. The real world difference between a tire with 70 or 75 is fractions of an inch. Barely noticeable and mostly in distinguishable. The 70 is a bit wider, the 75 is a bit narrower and taller.

A 315 is taller than either variant. My recommendation is to skip the fractions in height and go for the tallest tire option here asked by the OP.
Incorrect. They are the exact same width. 285 mm. The 70/75 is the ratio of the width to sidewall.
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Old 02-23-2013, 01:55 PM   #19
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Quote:
Originally Posted by Jammers

Incorrect. They are the exact same width. 285 mm. The 70/75 is the ratio of the width to sidewall.
And there is about a 1" height difference. The op was asking about 75's which are considered a 34.
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Old 02-23-2013, 02:00 PM   #20
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Quote:
Originally Posted by Jammers View Post

And there is about a 1" height difference. The op was asking about 75's which are considered a 34.
That one inch variance you keep referring to is only on paper. In reality, under load, the difference is much smaller.

All of the tires mentioned in this thread are well under 34" once they're under load at the proper psi.
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Old 02-23-2013, 02:13 PM   #21
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Incorrect. They are the exact same width. 285 mm. The 70/75 is the ratio of the width to sidewall.
No point in an disagreement here any longer.
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Old 02-23-2013, 02:15 PM   #22
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Quote:
Originally Posted by ESP

No point in an disagreement here any longer.
Math is math
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Old 02-23-2013, 02:18 PM   #23
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Math is math
You do realize that the tire math is essentially worthless once they're installed, right? You haven't been responding to my posts, so I can't tell...
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Old 02-23-2013, 02:19 PM   #24
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Jammers,

As mentioned, the is no need to derail this thread into a disagreement about tire sizes. If you have more to add to this thread that is directed at others or to the original post by the OP, please feel free to share. Any more comments pertaining to our discussion should be done via a PM.

If you choose not to do this, your post will be removed.
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Old 02-23-2013, 02:19 PM   #25
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Quote:
Originally Posted by paleh0rse
That one inch variance you keep referring to is only on paper. In reality, under load, the difference is much smaller.

All of the tires mentioned in this thread are well under 34" once they're under load at the proper psi.
Yes. That happens with both tires the 70 & the 75. The 70's end up being closer to 32 where the 75's will end up larger. Closer to a 33". There aren't many 75's made though. Toyo and nitto make them for sure.
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Old 02-23-2013, 02:22 PM   #26
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Quote:
Originally Posted by ESP
Jammers,

As mentioned, the is no need to derail this thread into a disagreement about tire sizes. If you have more to add to this thread that is directed at others or to the original post by the OP, please feel free to share. Any more comments pertaining to our discussion should be done via a PM.

If you choose not to do this, your post will be removed.
The op was asking about 285/75/17 tires.
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Old 02-23-2013, 02:26 PM   #27
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The op was asking about 285/75/17 tires.
I'm looking at several of our sites and it looks like there is only about 1-3 options in this size. Not a popular size by most accounts for sure. This is an odd ball size, the standard is usually 285/70/17.
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Old 02-23-2013, 02:27 PM   #28
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Yes. That happens with both tires the 70 & the 75. The 70's end up being closer to 32 where the 75's will end up larger. Closer to a 33". There aren't many 75's made though. Toyo and nitto make them for sure.
Again, your measurement (a near 1" difference) is way off. In reality, once the tires are installed and run at roughly the same pressure, the difference between the 70 and 75 versions becomes much smaller (closer to 0.2").
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Old 02-23-2013, 02:44 PM   #29
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Originally Posted by paleh0rse
Again, your measurement (a near 1" difference) is way off. In reality, once the tires are installed and run at roughly the same pressure, the difference between the 70 and 75 versions becomes much smaller (closer to 0.2").
I would like to see pics of those measurements
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Old 02-23-2013, 02:55 PM   #30
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I would like to see pics of those measurements
I would like to see pictures of your measurements, since you claim them to be 1 inch difference installed under the weight of the vehicle. Experience tells me otherwise.

Also OP, I would go for the Duratracs. Super tires, can't go wrong, and yours are 3 ply. I wheeled the 2 ply a ton and put them through hell before I finally killed one. They work well off road and are the best on road tire I have experienced.

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