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  #1  
Old 12-21-2015, 02:58 PM
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Rear wheels corrected, but not 100% vertical

Hi there,
Today I went to some wheels alignment shop to have my 2009 X5 rear negative camber fixed.
As most of you know, the negative camber is intentional on most German cars to help maneuvering at hard turns with high speed, but it causes the inner tip of tires to wear quickly.
Well, I'm not racing in my X5!
It was really an easy $40 job and all they had to do is to unscrew a nut (seen from other side) and rotate the red-circled eccentric bolt half a turn! see photo.
Pasteboard — Uploaded Image
The camber is now better but it's not 100% vertical.
However, they said they can make it 100% vertical by drilling some upper link to make its inboard hole looks more like an "egg-shaped" instead of just round, so as to allow more camber tilt of wheels.
I'm not sure if I'll do this drilling in future.
You guys have a nice day!
IMPORTANT UPDATE:
A toe alignment would be needed to compensate for rotating above bolt!
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Last edited by nezarnuaimat; 12-22-2015 at 03:10 AM.
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  #2  
Old 12-21-2015, 05:47 PM
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Slight negative camber counters the tires tendency to roll towards the outside of the corner, lifting the inside edge of the contact patch.

BMW makes much of the Kamm circle of forces. A third dimension of vertical forces can be added to illustrate tire roll.
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  #3  
Old 12-21-2015, 06:37 PM
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Quote:
Originally Posted by nezarnuaimat View Post
Hi there,
Today I went to some wheels alignment shop to have my 2009 X5 rear negative camber fixed.
As most of you know, the negative camber is intentional on most German cars to help maneuvering at hard turns with high speed, but it causes the inner tip of tires to wear quickly.
Well, I'm not racing in my X5!
It was really an easy $40 job and all they had to do is to unscrew a nut (seen from other side) and rotate the red-circled eccentric bolt half a turn! see photo.
Pasteboard — Uploaded Image
The camber is now better but it's not 100% vertical.
However, they said they can make it 100% vertical by drilling some upper link to make its inboard hole looks more like an "egg-shaped" instead of just round, so as to allow more camber tilt of wheels.
I'm not sure if I'll do this drilling in future.
You guys have a nice day!
changer the camber will affect toe..... and your description of what they did seems like they only modified camber.
not good.
and i would go to the minimum suggested camber setting, not try to get it to 0 camber.
just because its not a racecar doesnt mean anything.......
its really about how much the vehicle weighs and how that weight shifts during turns.
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Old 12-21-2015, 08:12 PM
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Messing with suspension like that just to have some perceived tire longevity, wow..
Bad toe is what wears out tires, not the camber. Having bad toe and zero camber will wear out the tire evenly across the width. Negative camber will only show that there's a problem with your toe.
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  #5  
Old 12-21-2015, 10:05 PM
ard ard is offline
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Quote:
Originally Posted by nezarnuaimat View Post
Hi there,
Today I went to some wheels alignment shop to have my 2009 X5 rear negative camber fixed.
As most of you know, the negative camber is intentional on most German cars to help maneuvering at hard turns with high speed, but it causes the inner tip of tires to wear quickly.
Well, I'm not racing in my X5!
It was really an easy $40 job and all they had to do is to unscrew a nut (seen from other side) and rotate the red-circled eccentric bolt half a turn! see photo.
Pasteboard — Uploaded Image
The camber is now better but it's not 100% vertical.
However, they said they can make it 100% vertical by drilling some upper link to make its inboard hole looks more like an "egg-shaped" instead of just round, so as to allow more camber tilt of wheels.
I'm not sure if I'll do this drilling in future.
You guys have a nice day!

You are misguided...

Do not ruin your car.,

DO get a proper alignment and set the TOE on all 4 wheels to 0.02.

IMO it is the TOE settings that are killing your tires- you think you can SEE the camber is pushing the inner edge down, you see the wear, you think that is the issue. YOU CANNOT SEE TOE.

Read some of the 20, 30 threads here and on bimmerfest on optimized alignments... lots of data. All of them involve measurements and not 'I can see the tire is vertical'.

Post your alignment specs, I will give you advice. Without actual measurements you are kidding yourself
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  #6  
Old 12-22-2015, 02:41 AM
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My alignment

Hey sorry to jump in but I'd like some help.
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Old 12-22-2015, 03:08 AM
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Dears Doug Huffman , Jyohay, seattle & ard,
You are all correct.
Rotating above bolt only would ruin the toe, so another alignment would be needed for toe to compensate, which I had to do yesterday.
I would add this note to original post.
Thank you dears,
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Old 12-22-2015, 01:52 PM
ard ard is offline
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Originally Posted by dabenthusiast View Post
Hey sorry to jump in but I'd like some help.
So looks like toe was horrific, and was set to simply 'not very good'...

You get under 5000 miles on those tires??

You see the way the alignment specs/graphic display DRIVES the tech to set in the middle?!?!?

But hey, what 'help' are you seeking??
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Old 12-22-2015, 02:25 PM
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Quote:
Originally Posted by ard View Post
So looks like toe was horrific, and was set to simply 'not very good'...

You get under 5000 miles on those tires??

You see the way the alignment specs/graphic display DRIVES the tech to set in the middle?!?!?

But hey, what 'help' are you seeking??



Yes it was horrible! Now it's still pretty bad haha
If I take it back can i get the tow corrected so tires don't get eaten up ?
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  #10  
Old 12-22-2015, 02:42 PM
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Originally Posted by dabenthusiast View Post
Yes it was horrible! Now it's still pretty bad haha
If I take it back can i get the tow corrected so tires don't get eaten up ?
What was on the work order and did you accept it as satisfactory? Prolly not.

I cut garlic and onions two summers in HS.
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