70% is in the range for me. There is kind of a lot going on that might influence a preference. In my experience, most people seem to like suspensions on the stiff side. Talking about regular street riders here. I think it's because it makes the bike feel more solid, or stable, (talking about older bikes here) but I think a bit softer, more compliant setups are better if you're not racing. (Sometimes if you are depending who you ask!) regardless, that will surely be ok for setting up the basic chassis layout.
Ideally, you'd want the swingarm pivot to be coincident with the countershaft sprocket so the sprocket center to center distance was constant and chain interference with the swingarm impossible, but as long as the countershaft is reasonably close to the pivot and on the centers line, it all works plenty good enough.
It may be useful to keep in mind that street bikes operate mostly with their suspensions fairly close to their loaded sag. So mostly, that's where the suspension will stay aside from large braking an acceleration inputs. They don't have to deal with giant bumps and the resulting radical changes in geometry found in dirt bikes.
Ideally, you'd want the swingarm pivot to be coincident with the countershaft sprocket so the sprocket center to center distance was constant and chain interference with the swingarm impossible, but as long as the countershaft is reasonably close to the pivot and on the centers line, it all works plenty good enough.
It may be useful to keep in mind that street bikes operate mostly with their suspensions fairly close to their loaded sag. So mostly, that's where the suspension will stay aside from large braking an acceleration inputs. They don't have to deal with giant bumps and the resulting radical changes in geometry found in dirt bikes.
