Is the 21.5" pitch Enertia Eco XP made by adding cup to the 21" pitch regular Eco casting? As opposed to removing pitch from a higher pitch casting? I ran the 21p regular Eco on my rig and it was almost perfect but wanted a tad more grip. If the 21.5" pitch XP has more cup therefore grip than the 21" pitch regular Eco, it may be the one!
