I spoke with JamesOC @ SuspensionWerx who has installed a number of PUSH ACS3 systems - along with re-tuning fork dampers to work better with them.
The air bump stop only affects the end stroke ramp/support but the reason the system doesn't feel linear - has such a notably different midstroke rate compared to how it initializes - does come down to air volume inside the stanchion. The PUSH spring, spring guide and air bump stop system take up so much space there's limited air volume just like in a coil/oil moto fork.
He tunes the midstroke rate by varying the amount of oil in the spring side of the fork within a ~25cc range.
Nov. 14, 2017, noon - Andrew Major
I spoke with JamesOC @ SuspensionWerx who has installed a number of PUSH ACS3 systems - along with re-tuning fork dampers to work better with them. The air bump stop only affects the end stroke ramp/support but the reason the system doesn't feel linear - has such a notably different midstroke rate compared to how it initializes - does come down to air volume inside the stanchion. The PUSH spring, spring guide and air bump stop system take up so much space there's limited air volume just like in a coil/oil moto fork. He tunes the midstroke rate by varying the amount of oil in the spring side of the fork within a ~25cc range.