I have align my vehicle for years using string. Its very simple old school way of alignments. A lot of guys who build and race cars use the string to align the vehicle. My inside tire wear is due to issues with my Camber. I have a camber gauge that I use to adjust the angle if possible. My E420 camber is fixed on the rear but the problem is that the LCA outer bushing is worn and will not allow the vehicle to have the proper camber while there is weight on the suspension. If the vehicle is up in the air and suspension has the weight the wheel angle is perfect with not alignment problems. Once there is any weight put on the suspension the toe is correct but the camber becomes off. As a result the LCA out bushing forces the wheel to tilt inward and cause tire to wear uneven. Removing the bushing and replacing it with stock new bushing will correct the camber. I have read in the past that some people W124 correct there Camber problem by installing a shorter LCA like the BMW E36. Usually they had to get a shorter LCA because of modification to suspension such as lowering the vehicle. I have not modified and only upgraded my wheels to 18" about 11 years ago. I had no where issue until about 2 years ago.
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Originally Posted by KJZ78701
I am curious to know where you set your rear toe and how you created a square box with your strings.
Inner tire wear, assuming good suspension pieces, is the result of camber AND toe. If you have zero toe and still have inner tire wear you have more camber than you need or are not driving hard enough.
Rotating tires often can mask alignment problems. If you are aligned well for your driving style, you should not need to rotate tires unless you want to go front to rear because your drive tires are wearing faster.
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