Originally Posted by
Marigold Original RBTM's used a roller bearing. This made the steering lighter than standard hence their use for the top end/competition cars. The rubber part provides some level of shock absorbsion which helps the shell. Even the standard type of top mount incorporates a rubber part for this reason. Alloy ones have been known to provide a harsher ride and even break due to the lack of any shock absorbing rubber.
There are two versions of the original style RBTM now, the OEM with roller bearing or a new version with a spherical bearing. This new one is capable of taking higher angles of caster/camber BUT will not improve how light the steering feels!
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