For more than a decade MTB forks have had very little space in the lowers for lubrication. Like 10-15cc of volume. If you add more than that then the fork becomes very progressive at the end of it's travel. Since the lauch of Buttercups most riders have complained that those forks are very very progressive at the end of their travel. Well the Buttercups sit in the same tiny space that the lower leg lubricant goes. I would expect that the new extra volume add-on on these pro forks is to make up for the loss of volume from the...