The Problem
If you’ve done any seriously twisty ‘wheeling, you know how quickly regular poly spring bushings get chewed to dust. The reason is that the spring pack is U-bolted to the axle. And the traditional frame mount is rigid, too. So, as the axle angles over obstacles, the spring has no choice but to twist laterally. That not only chews up bushings, but it also limits axle articulation and stiffens the spring rate. A twisted spring cannot respond as well to terrain changes.
