My point was not really about speed. I was referring too chain/swingarm geometry and rake change. The more you increase the movement of the swingarm. The more that geometry between the drive sprocket to rear sprocket is going change. So it "Could" create a chain tension issue. Until I get my new swingarm, I really cannot do a good test of this. I'm really hoping that a chain tensioner is not going to be needed ! If what your doing works good, then that just adds another viable option.