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  1. #1
    Senior Member rallen's Avatar
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    chain length question on compact cranks

    given a chainstay length of 40.6 cm and a compact crankset and 11-23 cassett

    checking chain tension by placing the chain on the small (34) ring in the front and the small ring in the back (11) should the chain be laying on the chainstay? (I know you don't ride in this combo, but per KMC in this scenario the chain should run "as close as possible to, but just free of the derailer pulley")

  2. #2
    In beaurocratic limbo urbanknight's Avatar
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    http://sheldonbrown.com/derailer-adjustment.html#chain

    The best technique for setting chain length is to 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 they could be connected (outer link meets inner link), then make the chain one complete link (one inch) longer than that. In almost all cases, this will give the optimum length.

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