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  • There is a simple check on Sheldon Brown's website: "thread the chain onto the large/large combination, without running it through the rear derailer. Mesh the two ends on to the large chainwheel so that one complete link (one inch, -- one inner and one outer half-link) overlaps. In almost all cases, this will give the optimum length"

    This method is also shown in a BikeRide video here:­TJw&t=44s


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