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Old 04-22-2014, 04:17 PM   #1
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Wear Parts from Larger Tires?

Guys,
I have heard a few comments of running even a 34" tire in regards to having to replace parts that will get worn out faster than with stock tires. I will be running 95% roads, with little trails, etc. I have a 2010 Rubicon with 4:10 gears, and really only want to run 33" tires. 6 spd trany. Is this size of tire really going to have that much effect on the ball joints, arms, and whatever else?? I guess I am use to running 35's on my F350 with no issues for over 152000 miles. Thanks again guys.

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Old 04-22-2014, 04:54 PM   #2
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The factory ball joints are junk anyways. Larger tires will accelerate wear for sure.
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Old 04-22-2014, 04:57 PM   #3
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O.k., this is a excellent question!
If you run 33s on your stock factory wheels, then the larger tires will not have any negative effect on ball joint wear. The reason is, because you are keeping the centerline of the tire, in the same proximity of the mounting hub flange. So your ball joints really don't care, because the weight distribution on each side of them, hasn't changed!
So as long as the tire is in balance, then it will have no negative effect.
With this set up, you may get a slight rub on tight turns. But running 95% on roads, you should be good to go!

What you have been reading about, is when adding wheel spacers, or changing the backspacing, (moving the wheel, and tire out further), now you have changed the geometry, and added addition stress to the ball joints, and wheel hub bearings. The ball joints are a weak link to start with, partially due to the fact, that they don't have any grease fittings. So yes, the added stress, will accelerate the wear factor.

You have a excellent set up with a 4.10 ration, and a 6 speed, plus 33s!

So keep your stock wheels, install your 33s, and enjoy your ride......
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Old 04-22-2014, 05:25 PM   #4
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285/70-17's may rub with stock rims and no spacers on sway bar and air dam if still running it. both are easy fixes tho.
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Old 04-23-2014, 08:00 AM   #5
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Thank you for the great replies guys. I should have mentioned that I did purchase a set of Pro Comp wheels that are 17x9 and 4.75 back spacing. I really do not know the factory back spacing. Is this a lot? Should I just sell them and run factory? I was looking at the 285/75-17 tires either Falken or the Duratracs. The 285's compared to some of the 33" tires is not much difference. Thanks again.
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Old 04-23-2014, 08:09 AM   #6
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that bs will be fine. 285/75-17's are what I run and are considered 34's. I think they work very well. not too big not too small.
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Old 04-23-2014, 09:52 AM   #7
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Don't forget to adjust the speedo to account for the larger tires. You can use an AEV ProCal type device to do that.
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Old 04-23-2014, 09:55 AM   #8
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Quote:
Originally Posted by 2010 Blue Rubicon View Post
Thank you for the great replies guys. I should have mentioned that I did purchase a set of Pro Comp wheels that are 17x9 and 4.75 back spacing. I really do not know the factory back spacing. Is this a lot? Should I just sell them and run factory? I was looking at the 285/75-17 tires either Falken or the Duratracs. The 285's compared to some of the 33" tires is not much difference. Thanks again.
The factory back spacing is 6.25.

Mopar makes rims for running larger tires and I believe they have 4.6 back spacing.

4.75 should be fine if running a 285.
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Old 04-23-2014, 10:27 AM   #9
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However, since you are changing the backspacing the bearing loading and scrub radius will change. So they may wear out faster than the stock configuration. Besides any time you change the unsprung weight you also increase loading the suspension and steering joints. All of the changes are relatively minor so the practical impact may be somewhat negligible but the exist.

As KJeeper pointed out most think the stock ball joints are junk because they wear out fast er than normal, which is mostly due to the plastic cup liner in the ball joint. However, that liner actually improves ride quality so it's a tradeoff. Given the tough workload they carry it is hard to argue against replacing them with a quality aftermarket product like Synergy once they wear out.
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Old 04-23-2014, 12:55 PM   #10
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Quote:
Originally Posted by spinlock View Post
However, since you are changing the backspacing the bearing loading and scrub radius will change. So they may wear out faster than the stock configuration. Besides any time you change the unsprung weight you also increase loading the suspension and steering joints. All of the changes are relatively minor so the practical impact may be somewhat negligible but the exist. As KJeeper pointed out most think the stock ball joints are junk because they wear out fast er than normal, which is mostly due to the plastic cup liner in the ball joint. However, that liner actually improves ride quality so it's a tradeoff. Given the tough workload they carry it is hard to argue against replacing them with a quality aftermarket product like Synergy once they wear out.
Good info spinlock!

Also, with more unsprung weight the brakes will wear quicker too.

Not to mention the stopping distance will be increased. (Will take longer to stop).

Other things to consider are the feeling of "heavier steering" and the acceleration performance will be decreased.

That being said, you aren't planning to significantly change from the stock setup so you probably won't notice anything drastic if at all.

Just some things to keep in mind!
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Old 04-23-2014, 02:52 PM   #11
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Thank you agin for the great advice guys. I really do appreciate it.
take care.
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Old 04-23-2014, 02:59 PM   #12
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And by the way that was a type O on my side. Just going to run 285/70-17, almost a 33" tire.
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Old 04-23-2014, 04:02 PM   #13
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Originally Posted by 2010 Blue Rubicon View Post
Thank you agin for the great advice guys. I really do appreciate it. take care.
You're welcome! It's nice to have a community to draw on.

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Old 04-23-2014, 07:17 PM   #14
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Our last jeep, a 2010 JKU had the ball joints falling out of it at 50000kms ( 30000 miles) Very little off-road use, stock wheels.
We're a little harder on our 2013, so I'm expecting considerably less before it's time to change them.

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