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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #51  
Old 01-26-2014, 11:14 PM
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bluebee bluebee is offline
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For the record, a similar thread was opened today:
> E39 (1997 - 2003) > Uneven tire wear

Quote:
Originally Posted by bmw530ii View Post
Hey everybody. Today I was looking at my tires and noticed that my inner rear tires are wearing out unevenly. What's going on? The front tires are good.

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  #52  
Old 03-26-2014, 02:59 AM
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bluebee bluebee is offline
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For the related record, an interesting thread, with good details, was opened today, by Fudman:
> E39 (1997 - 2003) > Should I Attempt a Rear Alignment DIY

Quote:
Originally Posted by Fudman View Post
Just got new "shoes" for my car (Conti DWS). As part of the installation package, they gave me a front alignment (Hunter) and measured the back. My rear camber is a bit out of spec at -2.3 L & -2.4 R deg. Bentley's says -2.0 deg and the Hunter spec calls for -2.0 to -2.2 deg. However, my toe is worse at -0.20 L and 0.25 R. Bentley's says total toe is 22' +/-4' and Hunter spec calls for 0.15 - 0.22 deg.

I can bring it back and have them adjust the rear for $50 or I can DIY for free. Normally, I would never consider doing an alignment. However, I'm thinking about adjusting the rear toe myself and possibly reducing the rear camber to 1 deg (I don't really need the improvements to handling). While my alignment "tools" clearly lack the precision of a Hunter, my concerns about a DIY alignment are considerably less now that the car is older. I do have a few questions: Will making adjustments to the rear axle affect the front axle settings? Am I being penny wise and pound foolish (some might say cheapskate), since the tires cost $600 for the set?
See also the recent related thread:
> E39 (1997 - 2003) > Yet another...Front Wheel Alignment..Thread..with a possible solution?

Quote:
Originally Posted by aa240sx View Post
this guy over on the M5 forum seems to have come up with a hackjob method of adjusting front camber without having to buy a camber correction kit.
http://www.m5board.com/vbulletin/e39...ut-plates.html

Having just installed my third set of front tires due to really bad inner tire wear in roughly 4 years, I'm open to trying just about anything and reaming out the strut holes to make the camber adjustment seems viable.
I should point out that I did do a semi complete front suspension overhaul a couple years ago, but that I am riding on coilovers and no, I don't wish to switch back to stock ride height on stock struts as a solution.
An interesting corollary here is I did the alignment front and rear myself and the rear tires are wearing perfectly and show no signs of wearing out at least for another year or so. The nice thing about the rear suspension on these cars is that they do provide an eccentric bolt to adjust camber.

Thoughts?
If I were to do this what I am currently experiencing is really bad inner tire wear (front tires only) which I assume is attributable to a combination of toe and negative camber.
Which way should the top strut holes be reamed to introduce more positive camber, say at least 1 degree if not more? I assume these holes should be reamed towards the outer fenders and not towards the engine.
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Last edited by bluebee; 03-27-2014 at 05:14 AM.
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  #53  
Old 03-26-2014, 11:58 AM
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doru doru is offline
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Change the rear ball joints, then do an alignment and ask to have the wheels as straight as possible.
In 8 years of ownership I'm on my 2nd set of EVENLY worn tires. This 2nd set is at 85-90% for both winters & summers. BTW, you should check if the rear control arms and bushings (and sway bars) are still OK, but if the car wasn't abused on bad roads, those should last quite a while as opposed to the front counterparts.
This is the simplest answer for rear worn tires inwardly. And it works.
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  #54  
Old 10-20-2014, 02:26 PM
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There's a thread today, similar to this one, for reference:
> E39 (1997 - 2003) > Uneven Tire Wear... Alignment?

Quote:
Originally Posted by bmdubya1198 View Post
Now that I've finally gotten around to posting this, I've noticed that my rear tires have very uneven wear.
I had replaced my old style 5 wheels with the style 29s probably a little over a year ago because my mechanic told me that the wheels were warped, and apparently this is pretty common with the 2-piece style 5s. When I replaced the wheels, the ride had improved, but now I am noticing that the rear tires are very uneven.
When I bought the wheels, they came with Yokohama tires that had a good amount of tread, and I recently took off the rear wheels to check the wear because of this issue. The pass. side tire was worn more toward the inside of the wheel. The driver side tire was nearly bald.
I haven't been spinning the tires, and as many times as the mechanic tells me the alignment is good, I don't think it is.
Do you think it could be the alignment that is the problem, or is it something else? If it helps, I recently had issues with the passenger side air spring going out, and right now it's holding with some of that rubber spray stuff (which actually worked quite well).
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  #55  
Old 11-24-2014, 06:58 PM
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bluebee bluebee is offline
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This related information was posted here today ...
> E39 (1997 - 2003) > How do you break & seal the bead when replacing your own tires on BMW wheels at home?
Quote:
Originally Posted by MKJS View Post
Sealing a tire does require quite a bit of energy, that being muscle or machine, and quite a bit of air pressure both applied simultaneously.

As far as tire wear I'd suspect a bit too much toe out causing a bit excessive wear on the inner 50% of the front tires.

The stems you have chosen are used for high performance/race vehicles where damage to the stem can be life threatening and frequent. For most applications a standard stem is just fine.

On race cars toe is evaluated in the pits by reading tire temp at several places across the tread by IR as soon as the car comes in off the track.

You probably already know this stuff but if not, here is my very simple explanation of the axes and there effect:

Caster has the effect of asking the tire to return to center when disturbed from straight ahead.

Camber is used to bring the tire to level when hard cornering so that the entire tread is available for traction.

Toe used to counteract the forces of acceleration on wheel alignment during acceleration; toe in for a front wheel drive that has the tendency to cause the front drive tires to toe out upon acceleration and toe out for rear wheel drive cars that cause the front wheels to toe in just a tad upon acceleration.

There are also small adjustments made to street cars for the crown of the road but I have forgotten which axis this occurs in. Perhaps someone else who does these adjustments frequently can help here as I have forgotten some or all of this, or if i have totally screwed this someone please chime in and correct me as it has been a while since I worked on race cars.

Hope I have helped,
doc
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abnormal tire wear, alignment specifications, alignment specs, camber, front camber, front wheel alignment, rear camber, tire wear, wheel alignment


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