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Old 07-03-2002, 10:31 AM
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Join Date: May 2002
Location: Mass
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Originally posted by stevebfl
The wheels won't change the alignment but they will change what the specs should be. In the end the guy doing the alignment better have a good idea.

In the long run alignment specs will have to be developed to deal with what you have done. I would suggest a few extra millimeters of toe based upon the direction everything moves under the extra loading. Those can be applied now or later.
Back to the original question for a moment...
I am indeed confused.
I can see why the lower springs could influence the desired settings, such as the toe or perhaps the camber, but why would the wheels/tires themselves be a factor at all?
1986 300E 5-Speed 240k mi.
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Old 07-03-2002, 10:54 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
As I will now state for the third time, wheels and/or tires DO NOT affect the numbers on the machine. If it was at 3mm toe with one tire it will be the same with another.

The point is that changing tires changes the loading during driving. The specs that are given are a compromise designed to apply settings in a motionless state that will place things correct when driven. that is why the toe spec will have one set the front toed in. As the car drives down the road the rearward force deflects all the suspension pieces rearward. This makes the car pull itself relatively straight even though it were set toed in. Placing larger more agressive tread changes the relationship between motionless and loaded. This requires new specs. They aren't in a book they are the result of experience and observation. Its the reason all these huge tires wind up with inside tire wear. They were set to specs but in actual driving the real alignment winds up toed out under the heavier load.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 07-03-2002, 11:27 AM
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Location: Mass
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Thanks Steve.
I actually get it!
That clarification was very helpful.
1986 300E 5-Speed 240k mi.
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Old 07-03-2002, 11:42 PM
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Join Date: Sep 2001
Location: Austin, Tx
Posts: 713
yes, thanks a bunch steve! This is all making sense now...
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