Is 20 mm of play at the measuring point unsafe? That's where mine is, I did not previously check it. What is static trim value?
No don't move the chain up and down.As the manual says put the bike on a rear stand,turn the wheel to find the tightest part of the chain,then measure from the bottom of the guard to a rivet on the chain @6mm.Want to make sure I am understanding this correctly. Is the distance from the axis point of the chain to the guard supposed to be 6mm with the chain at rest , or 6 mm total movement of the chain when moving the chain up and down from its lowest to highest position.