I'm pretty sure it's a free wheel not free hub. The hub itself is one that is made of two or three pieces for the outer part. The wobble is side to side movementat the hub itself. I'll have to look at it again to make sure of what I'm talking about. I want a more solid hub that can withstand more. The bike itself will withstand the riding I do but the hub's and wheels aren't going to last very long at this rate.