The E9x M3 as well as E9X / E82 chassis have limited rear toe adjustment from the factory, and an aggressively lowered car will lack sufficient adjustment range to bring the toe within appropriate spec. Challenge's rear toe arms not only give a wider range of toe adjustment, but also include an eccentric bolt eliminator to fix the normal eccentric adjuster, allowing for more consistent alignment settings.

Challenge toe arms are constructed from 6061 aluminum, use high quality chromoly rod ends, and include tapered adjustment areas for the lowest possible stress riser along with rubber seals for the longest possible rod end service life. Optional all-weather full seal boots are also available