Always remember a golden rule, if you're not sure, run your chain loose ! I've seen so many people unknowingly run a chain too snug, and if you have a scenario where moist sand or dirt gets packed into the rear sprocket teeth, you can possibly explode the rear wheel hub from the chain slack tightening as your swingarm travels up through it's suspension stroke. FYI your front to rear sprocket center to center distance lengthens as your swingarm travels through the suspension stroke. Years ago when I was hardcore racing, I used to have 2 people sit on my bike to compress the suspension and get the swingarm parallel with the ground, then add 5/8" of chain slack for a safeguard. Nowadays the facrtory recommended specs are pretty safe.