Why is the rear suspension in a subframe?

E.R.A. is unique in using a subframe on every one of our roadsters. The subframe does several thing. : It isolates the differential noise and vibration from the chassis while still giving positive location to the suspension arms.

It makes servicing easier. It also lets us use trailing arms to locate the lower control arms as originally designed. Without trailing arms, the lower control arms are put into bending modes that they were never designed for, allowing excessive toe change with power and braking forces.

Contemporary Classics' (now the defunct Burtis Motorcars) replica has an optional Watts link system that partially compensates for this - for about $1500! Our subframe also makes it easier to service the assembly. The rear suspension can be built as a unit outside the car for convenience, and installed into the chassis in less than an hour.

Even our optional "track" suspension is in a subframe. More.

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