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Old 05-28-2012, 01:05 AM   #1
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Over thinking 35 " tires?

I have a 2012 Jk Rubicon, 4.10 gears, automatic trans, and decided to go with the Rock Krawler 2.5 Max Travel lift and 35" duratrac tires. Live in a mountain community where i drive up and down hills, but also do some regular freeway driving. Will do only light to moderate off roading. I like the looks of the 35's, but the more I read the more I'm concerned about added stress on the drive train and having to strenghten the axle, etc. Now I'm starting to reconsider and thinking 33's, but not sure they'd look right with my lift.

I'm new to this so any thoughts from knowledgeable folks would be appreciated. Thanks in advance.

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Old 05-28-2012, 01:31 AM   #2
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I have 35's and lower gears I have had no issues. your jeep will be ok.

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Old 05-28-2012, 03:39 AM   #3
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The stock balljoints are not all that good. I replaced mine for S&G's.
Depending if you are going to wheel it hard strengthening the C's would benefit
All depends on what you are going to do with it. I would not let it worry you,
that Is a good lift you got picked out there. You should do it
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Old 05-28-2012, 06:07 AM   #4
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33" too small. Stay with the 35", like everyone already mentioned. You will be fine, plus the new engine pulls 35's like they are nothing.
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Old 05-28-2012, 06:51 AM   #5
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Quote:
Originally Posted by chim-chim7
33" too small. Stay with the 35", like everyone already mentioned. You will be fine, plus the new engine pulls 35's like they are nothing.
Gearing my friend gearing

My 3.8 with 4.10's does just fine.

We don't want somebody with 3.21's thinking they could happily run 35's do you? Neither engine will help
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Old 05-28-2012, 07:00 AM   #6
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He said he had 4.10's already.
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Old 05-28-2012, 07:01 AM   #7
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Quote:
Originally Posted by chim-chim7
He said he had 4.10's already.
"rubicon" I know
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Old 05-28-2012, 09:22 PM   #8
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Thanks for your input, I appreciate it! I'm going with the 35" tires and will post my thoughts after I run them.
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Old 05-28-2012, 09:57 PM   #9
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We ran 37s on a 2010 with 373s for a year. No problems
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Old 05-28-2012, 10:06 PM   #10
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Old 05-28-2012, 10:30 PM   #11
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Considering most, if not all, "35s" aren't really 35s at all, I'd say stick with 35s. My 315/70-17s Duratracs measure only 33.5 mounted.
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Old 05-28-2012, 10:44 PM   #12
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To answer your question. No you are not over thinking tire size. It took me 3 weeks to finally decide on 33's. But in your case you have already bought the 35's I would just keep them and the money you would spend on 33's, you could buy other things.
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Old 05-28-2012, 11:20 PM   #13
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Your drivetrain will be fine with 35" tires. Throw on some c-gussets and a new front drive shaft and you'll be good to go.
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Old 05-29-2012, 12:47 AM   #14
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I worked the question in my head for weeks, go for 35" you won't be unhappy, go for 33" you'll be sorry.
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Old 05-29-2012, 01:02 AM   #15
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im also in the same boat, im also considering tire weight, the stock Rubicon tire weighs 46 lbs, a 305/70/16 (33") BFG km2 is 59 lbs, and a 315/75/16(35") is 66lbs. I use my rubi as a daily commuter and im afraid what my mpgs are gonna look like when i throw on the 35"s....

PS, spare me the "if u want a jeep don't look at the millage" speech
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Old 05-29-2012, 01:11 AM   #16
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Quote:
Originally Posted by river2c View Post
Your drivetrain will be fine with 35" tires. Throw on some c-gussets and a new front drive shaft and you'll be good to go.

NEW FRONT DS?????? what for I wheel my jeep hard and drive it every day like I stole it. I have 35's and one heavy ass set of 35's on stock 18" Sahara rims. My DS is fine I would not waste the money on a new one till I rip this one out. And FYI I go threw mud, sand and beat up the trails here on Island that have many rocks on them.
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Old 05-29-2012, 04:47 AM   #17
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Quote:
Originally Posted by Hieneken49
im also in the same boat, im also considering tire weight, the stock Rubicon tire weighs 46 lbs, a 305/70/16 (33") BFG km2 is 59 lbs, and a 315/75/16(35") is 66lbs. I use my rubi as a daily commuter and im afraid what my mpgs are gonna look like when i throw on the 35"s....

PS, spare me the "if u want a jeep don't look at the millage" speech
Running 35" Km2's and my mileage took a small hit.
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Old 05-29-2012, 06:21 AM   #18
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My experience is that if you keep it under 70, with 35's your mileage doesn't suffer that much.

Been running 35's on my 2009 Rubicon with stock axles and C's for over a yr, no problems and that is with rock crawling, mud diving, the whole mix.

Would like to boost the gear ratio in the future, understand that helps the older motors a good deal with MPG.
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Old 05-29-2012, 10:02 AM   #19
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No need for a new driveshaft until the one you have explodes (actually dont wait till it explodes, wait till it starts to get dented and torn up). I have a 4" lift that I use bumpstops to limit so the driveshaft doesnt rub. 35" KM2's and Pro Comp wheels. No gussets or anything helping the axle stay together.
I offroad weekly, no mud, its tough to find in Arizona but I am all over the mountains south of Tucson. I ise mine as a DD, and yes, I fill up more often then if I hadnt lifted it, but really its expected.
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Old 05-29-2012, 11:03 PM   #20
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Thanks again, great info, great forum!
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Old 05-30-2012, 12:42 PM   #21
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KM2 owners- how do you like 'em? Per above- you can't overthink. I bought 35" Toyos (83lbs!) and might swap them for KM2s (63 lbs). I've heard the KM2s are noisy.
Measly 3.21 gearing for my JK so 20 lbs. is a lot.
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Old 05-30-2012, 12:47 PM   #22
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KM2 owners- how do you like 'em? Per above- you can't overthink. I bought 35" Toyos (83lbs!) and might swap them for KM2s (63 lbs). I've heard the KM2s are noisy.
Measly 3.21 gearing for my JK so 20 lbs. is a lot.
I really like my tires, they have a couple good gouges from rocks, but they hold pressure very well, are not extremely bouncy and as far as noise, not by any means the loudest tires i have ever owned. They are closer to 34" though, so if you have to have 35" tires you may want to buy 37" KM2's.
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Old 05-30-2012, 12:58 PM   #23
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Quote:
Originally Posted by JeepHerz
KM2 owners- how do you like 'em? Per above- you can't overthink. I bought 35" Toyos (83lbs!) and might swap them for KM2s (63 lbs). I've heard the KM2s are noisy.
Measly 3.21 gearing for my JK so 20 lbs. is a lot.
I'm liking them. They do roar down the highway but I like it.

My 4.10's move em just fine
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Old 05-30-2012, 01:12 PM   #24
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Ah...to have a Rubicon.
I'll have a Rubi sway bar....close as I get.
Thanks for the quick input.
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Old 09-27-2012, 09:37 PM   #25
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83 lbs per tire and 3.21? What's your mpg with that?
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Old 09-28-2012, 10:03 AM   #26
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Originally Posted by river2c View Post
Your drivetrain will be fine with 35" tires. Throw on some c-gussets and a new front drive shaft and you'll be good to go.
Driveshaft? Why? Has to do with lift height not tire size.

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Old 09-28-2012, 10:06 AM   #27
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Love my 33's. no regrets at all
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