Originally Posted by DockingPilot
He will not use progressive springs feeling they throw off the bike or make it suspend differently at different times in the stroke. I dont kmow if there is any truth to that though.
There's a lot
of truth to that. Most suspension tuners will not use progressive rate springs--they're really just a holdover from old school damping rod designs, where it was difficult if not impossible to get something to damp correctly at all speeds. In the olden days it was near impossible to get the damping right, so you had to make due changing the only thing that could really be changed.
Not using them on more modern designs (not that the GS is THAT much more modern in design
) comes back to the fact that damping and spring rates are dependent. The range of spring rate is simply too large with progressive springs to achieve proper damping across the full range of fork speeds.