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    That's a long cage derailleur, no doubt!
    – Carel
    Commented Aug 5, 2014 at 18:40
  • If you want a metric, presumably you could test the tooth capacity of the unit. Commented Aug 6, 2014 at 2:06
  • Any longer and it would drag on the ground!
    – andy256
    Commented Aug 6, 2014 at 3:14
  • Shimano rear derailleurs have the model number stamped into the metal of the inward facing aspect of the parallelogram. This does NOT include any designation (SS, GS, SGS) as to the cage lengths. Some models--especially those designed for 11 or 12 speed rear drivetrains--will have cage length designation (GS or SGS) stamped into the metal of the inner cage plate.
    – Jeff
    Commented Jan 9, 2023 at 7:47