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You measure the slack right between the 2 sprockets and you want about 1 inch of play up/down from a starting point;
let me be precise here:

When not touching it,bike straight and no rider on...

1 inch when pushing it up from where it was when you werent touching it
1 inch down,same as above for a total up/down of about 2 inches (a bit less is good,more is baaaad).
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