Lean to turn ratio is simply defied by the pivot axis angle compared to the horizontal plane. Both zero and 90 degrees cannot turn. 45 degrees gives you equal lean and turn angles. Below 45 degrees, you turn less than you lean which in esk8 is in my opinion is desirable, above 45 degrees, you turn more than you lean which again, in my opinion is less desirable. Most channel trucks rely on direct compression of the bushings. In compression, urethane can only deform since it cannot compress. In the Duality, the bushings are in line with the pivot axis so they are deforming the bushing, not compressing is so there is much greater range of motion. I tried to convey this concept on my “Singularity” thread and someone paid attention.