Chains never need to be put on "really tight". They also don't "stretch", they wear. Any slacking on a new chain is due to the wheel moving forward, not you being superman and stretching steel links.
@hippy started
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Chains never need to be put on "really tight". They also don't "stretch", they wear. Any slacking on a new chain is due to the wheel moving forward, not you being superman and stretching steel links.