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Old 07-29-2011, 01:48 PM   #1 (permalink)
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Irok Bias plys on DD

Ok, so, I've been trying to decide on what tire to go with for my JK next. I just sold my 35" MT/R Kevlars and I loved them, but it's time to go bigger. I've got a set of Currie 60's on order and I'm contemplating 40's.

That being said, what should I expect if I attempt to DD my JK on Irok 40x13.5-17 Bias plys?

I know they'll flat spot when they sit a while, but they should smooth out after they're driven a little ways, right? What about highway driving? Any issues that I should know about before dropping the coin?

OR

Should I just go with 41.5x13.5-17 Pitbull Rocker Radials? I really want to do that, but I think my 3.8 will hate me if I do.
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Old 07-29-2011, 02:04 PM   #2 (permalink)
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i wouldnt be concerned with the ride as much as the 5k miles your gonna get outta them on the road, especially iroks.

and they ride like shit, even after warming up. in winter, itll be a challenge just keeping it on the road.
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Old 07-29-2011, 02:09 PM   #3 (permalink)
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i wouldnt be concerned with the ride as much as the 5k miles your gonna get outta them on the road, especially iroks.

and they ride like shit, even after warming up. in winter, itll be a challenge just keeping it on the road.
x2. They will never smooth out. Get some radials and be done.
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Old 07-29-2011, 02:34 PM   #4 (permalink)
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That's what I wanted to hear. Thanks, guys.

Sure wish I could get ahold of a set of Kevlar 40's and be done with it.

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x2. They will never smooth out. Get some radials and be done.
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i wouldnt be concerned with the ride as much as the 5k miles your gonna get outta them on the road, especially iroks.

and they ride like shit, even after warming up. in winter, itll be a challenge just keeping it on the road.
Does the same 5k apply to the radials?
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Old 07-29-2011, 02:37 PM   #5 (permalink)
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I dont have a durometer reading on either, but the radials appear to have a much harder compund than the bias ply. I still wouldnt plan on getting more than 15-20K out of the radial.
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Old 07-29-2011, 02:48 PM   #6 (permalink)
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15-20k wouldn't be too bad. I only do about 10k/year and I'll be runnin' a 6 tire rotation since they're directionals so I might get 20-25k out of 6, yeah?
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Old 07-29-2011, 02:58 PM   #7 (permalink)
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I think it could be done if you rotated them religiously and kept the air psi where it needs to be. Of course that all depends on your driving style.
I can kill a set of AT's with my DD in 20K miles.
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Old 07-29-2011, 05:01 PM   #8 (permalink)
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your welcome.

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Old 07-29-2011, 05:16 PM   #9 (permalink)
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4D" MT/R's is my vote... My buddys 40" LTB suck so much ass you can't drive over 45mph in his TJ..
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Old 07-29-2011, 06:28 PM   #10 (permalink)
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A friend of mine has 39 inch iroks bias on his truck and there 50 percent at 2000 miles. I'm in the same boat as I've got a set of mtrs ordered several monthes ago waiting for delivery. I'd like to hear what kind of life people are getting out of the pitbull radials.
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Old 07-29-2011, 07:08 PM   #11 (permalink)
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4D" MT/R's is my vote... My buddys 40" LTB suck so much ass you can't drive over 45mph in his TJ..
It's 50mph.... and it goes faster on LTBs than your Jeep does on jack stands


















FWIW my next tire will be either a GT MTR/K or Pitbull Rockers... though I'm hoping it will become a trailer queen by the time my tires wear out.
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Old 07-29-2011, 11:06 PM   #12 (permalink)
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I think it could be done if you rotated them religiously and kept the air psi where it needs to be. Of course that all depends on your driving style.
I can kill a set of AT's with my DD in 20K miles.
Point taken. I'm a conservative in every sense of the word now that I'm aging a bit. Speed was cool when I was younger.

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4D" MT/R's is my vote... My buddys 40" LTB suck so much ass you can't drive over 45mph in his TJ..
I would kill for a set of 40" MT/R's. Ok, not a person, but I'd definitely kill something.

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A friend of mine has 39 inch iroks bias on his truck and there 50 percent at 2000 miles. I'm in the same boat as I've got a set of mtrs ordered several monthes ago waiting for delivery. I'd like to hear what kind of life people are getting out of the pitbull radials.
Again, MT/R Kevlars would be a perfect scenario, but I can't wait much longer. I'll be back from Iraq at the end of August and I'm planning on doing the next phase of the build (because it's NEVER done) around the weekend after Labor Day or thereabouts. Gotta shit or get off the pot at this point.

I'm seriously considering the 41.5" Rocker Radial, but I'm afraid my 3.8L will revolt against me so I'm thinking I should wait until I upgrade to the 3.9L before running that big of a tire.

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It's 50mph.... and it goes faster on LTBs than your Jeep does on jack stands

FWIW my next tire will be either a GT MTR/K or Pitbull Rockers... though I'm hoping it will become a trailer queen by the time my tires wear out.
Good luck on the Kevlars. I've been wanting a set of them for over a year.
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Old 07-30-2011, 09:47 AM   #13 (permalink)
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Old 07-31-2011, 06:57 PM   #14 (permalink)
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I had 39.5 Irok's on my rig after I built it and ran them for about 8-10 months. It nearly killed the tires - in a year they would have looked like racing slicks. I had all kinds of mild death wobble and the flat spots NEVER went away.

I bought a set of 40" MTR's and it's like a whole new Jeep. I LOVE these tires on the street. They balance nicely, they're quite and they have worn beautifully - I've been driving them daily for almost 5 months.

I live in Houston and my daily commute is just shy of 40 miles round trip. I'm on the interstate everyday and these tires will cruze at 80 MPH with ease.
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Old 08-01-2011, 12:18 AM   #15 (permalink)
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It's 50mph.... and it goes faster on LTBs than your Jeep does on jack stands
















FWIW my next tire will be either a GT MTR/K or Pitbull Rockers... though I'm hoping it will become a trailer queen by the time my tires wear out.

Loc D, you think my jeep will go over 50mph with a 25 inch front stretch and 700 inch tires
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Old 08-01-2011, 05:04 AM   #16 (permalink)
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Ok I have Kevlar mtr 35s on my rig. Yes, their an amazing tire. Over the wknd I rode in a tj on rockers 36s. Then I see this thread with ppl saying they'd take either for a rig that sees decent amount of street. I can assure u the rockers ain't even close to mtr's in ride quality on pavement. No comparison whatsoever. Goodyear clearly did their homework. BTW his rockers are dam near new. My mtr's have bout 500 street miles n over a yr of trail beatings.
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Old 08-01-2011, 07:01 AM   #17 (permalink)
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i wouldnt be concerned with the ride as much as the 5k miles your gonna get outta them on the road, especially iroks.

and they ride like shit, even after warming up. in winter, itll be a challenge just keeping it on the road.
I don't know about winter driving, but the rest is true. You'll wear them out real fast and they ride/handle like shit on the street.
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Old 08-01-2011, 11:51 AM   #18 (permalink)
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Ok I have Kevlar mtr 35s on my rig. Yes, their an amazing tire. Over the wknd I rode in a tj on rockers 36s. Then I see this thread with ppl saying they'd take either for a rig that sees decent amount of street. I can assure u the rockers ain't even close to mtr's in ride quality on pavement. No comparison whatsoever. Goodyear clearly did their homework. BTW his rockers are dam near new. My mtr's have bout 500 street miles n over a yr of trail beatings.
I wasn't very detailed at my last response... I want to have a house and a trailer(not a trailer as my house) some time in the near future... if I am still driving my Jeep on the road then I'll go for MT/Rs... but if I can trailer it then I'll get some bias ply Rockers.

I haven't seen too much feedback on them... but the Radial Rockers are supposed to be pretty damn good on the street. I'd consider the 41.5s myself.
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Old 08-01-2011, 04:00 PM   #19 (permalink)
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I'll chime in

I have 39" IROKs (bias) on my cj7 100" wb and it's a dd. I don't drive far at all to work (~3 miles). The jeep is driven everywhere including some 6 hour drives to MT. No, they do not last long on pavement.

The only way to get a good balance on the tires is with bb's. I've tried doing it with weights and they needed too much weight. However they are not far enough out of balance to cause problems.

Flat spotting has only been a problem for me in the winter. (i've driven them to work at -15*) Even then they still round out after warming up.

I agree with what has been posted. Don't get Iroks for a dd.

As for the Rocker radials. I have experience with them and love them. The rubber is harder then the bias Rockers (that's good for a dd). The radials as you would expect are more square than the bias tires (especially compared to the 39's at 16" wide). They have a nice hum to them going down the road but it isn't obnoxious.

The radial rockers seem to run tall compared to other pitbull tires. the 37" radials are extremely close to the height of the 39" bias tires.

I have run both the bias and the radial rockers and prefer the radials on a dd. The tires take a balance fairly well and last longer.

When my Iroks wear out I want to get the 41" radials as long as they are close to the same size.

*i haven't owned anything other than Interco tires in the last 10 years so my idea of a smooth ride might be a little off...
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Old 08-02-2011, 12:36 AM   #20 (permalink)
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I wasn't very detailed at my last response... I want to have a house and a trailer(not a trailer as my house) some time in the near future... if I am still driving my Jeep on the road then I'll go for MT/Rs... but if I can trailer it then I'll get some bias ply Rockers.

I haven't seen too much feedback on them... but the Radial Rockers are supposed to be pretty damn good on the street. I'd consider the 41.5s myself.
I'm leaning that way, but I'm kinda wondering if my 3.8L is gonna revolt when I put them on.

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Originally Posted by 1tuffyj View Post
Ok I have Kevlar mtr 35s on my rig. Yes, their an amazing tire. Over the wknd I rode in a tj on rockers 36s. Then I see this thread with ppl saying they'd take either for a rig that sees decent amount of street. I can assure u the rockers ain't even close to mtr's in ride quality on pavement. No comparison whatsoever. Goodyear clearly did their homework. BTW his rockers are dam near new. My mtr's have bout 500 street miles n over a yr of trail beatings.
I loved my MT/R Kevlars. I just wish Goodyear would make them now.

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I had 39.5 Irok's on my rig after I built it and ran them for about 8-10 months. It nearly killed the tires - in a year they would have looked like racing slicks. I had all kinds of mild death wobble and the flat spots NEVER went away.

I bought a set of 40" MTR's and it's like a whole new Jeep. I LOVE these tires on the street. They balance nicely, they're quite and they have worn beautifully - I've been driving them daily for almost 5 months.

I live in Houston and my daily commute is just shy of 40 miles round trip. I'm on the interstate everyday and these tires will cruze at 80 MPH with ease.
See above...

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Just a little wider than I want to go. I'm pushin' it to even consider a 41-42" tire... go 15" wide and I'm gonna open up another can of worms.
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Old 08-02-2011, 04:51 AM   #21 (permalink)
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I don't know why you can't get 40" MTRs, but I've DD my jeep with bias ply iroks for 3 yrs, I got 20K out of my first set. I can drive my jeep fine at 70 mph. I'am up in alaska now and drove here from chicago. I did a wheeling trip to colorado a few years ago. Its the only vehicle I own, and I put about 15,000 miles on it per year. The only thing is that there pretty loud, but i'am sure you expect that. btw they don't flat spot as bad as you think they might.
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Old 08-02-2011, 01:23 PM   #22 (permalink)
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What about BF Goodrich KM2's?
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Old 08-02-2011, 05:50 PM   #23 (permalink)
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I like my KM2s...but I'd go with either the PBR Radials or MTR/K. That's what I'm considering next...
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