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Tech Article

Anti-roll bar variations at rear of E30

Last Updated: 07/24/2020
Parts Group: Anti-roll bar assembly
This article discusses the rear anti-roll bar on the E30. with the main focus being on variations.

If you're not here for the technical analysis but would rather buy a used unit from us, guaranteed to work and fit, then please select the link below.

Much of the information herein is based on my own car, verified personally, e.g., dial caliper in hand.

There are many different diameters of anti-roll bar for the E30. Some diameter values are used, for example, in a particular set of years for a particular body/trim level of E30. But that same bar may have also been used exclusively on the sport suspension package during a different set of years.

The bars appear to have been swapped out by the BMW engineers as needed in order to fine tune the handling of a particular car. So, finding the "correct" variation of which bar should be on which model year, from the factory, can be daunting, especially when the schematics do not match what we observe on our own cars.

It is likely that any of these bars are technically swappable with each other, assuming you have the correct mounting rubber (which is mated to the diameter of the bar it services, since the bar has to fit snugly inside the hole in the rubber). The brackets and (surprising to us) the end links are the same part number regardless of what diameter bar is actually selected.
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