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Originally Posted by asid61
What defines "tensioned"?
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Tension is the force applied to a member in the direction that will cause it to expand. In this case, it refers to the force applied by the sprockets to the chain when there is no work being done (usually no motion at all). Chain tension is rarely measured directly, but estimated by pushing transverse on the midddle of the chain run and watching the "rebound". Just like the string on a musical instrument, a chain under more tension will be harder to displace, will return more quickly to the center, and will oscillate more quickly. Usually we just make sure it feels right; most of us grew up with bicycles and know what a properly tensioned chain feels like. Note that the required at-rest tension does depend on the load tension, and also the length of the runs. If you want to see how well you are tensioned, the real test is to put the chain under peak load and watch the loose side of the chain (the return to the drive gearbox). If its motions don't make you worry about the chain ratcheting or jumping off, you should be good.