An inherent characteristic of coil springs is that as they compress
they produce a lateral, or sideways load acting on the shock shaft
trying to bend it resulting in highly increased frictional forces within
the damper, these extra forces give lowered tyre grip levels, and
increased tyre wear.
The assembly allows the end coils of the spring to tilt (up to 4
degrees) as compressive loads are applied centralising the loads fed
into the shock. The result is that up to 96% of the bending is
eliminated increasing mechanical grip.