Why does a single-shock set-up work better than twin shocks?

The greatest difference comes from how the dampers are driven. With twin shocks the dampers travel almost the same distance as the wheel.

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The tends to over-heat the oil in the unit. With a single-shock system the wheel to damper travel is geared down to a ratio of 2.5:1.

This massively reduces the internal friction caused by the movement of oil in the damper so the shock performance is more consistent.