Primary drive is the brandname, and its rear chain.
Not an O-ring fan up till now but have been trying it of late, I just grabbed this as I need to do an extended swingarm, plus have one on my other bike.
It is 520 X 120 links.. so long enough, and I will thin a set of sprockets..
Not really wanting to discuss pros/cons..rather wanting to see if anyone tried the brand..