Originally Posted by
Tyler Keel
Different compound. I believe the B44 rear arms are a softer plastic, allows more flex. I believe it only makes a "noticable" difference on high bite surfaces. I'm using them in combo with the B44 stock rear hubs (0*) and I love the way it drives.
think it has been said that b4 is the most stiff, followed by b44 arms, followed by b4.1 arms.