• Increase maximum cassette sprocket capacity by 4-10T
    • For road bike short cage rear derailleur(SS) to use with maximum cassette sprocket of 32/34/36T
    • For road bike medium cage rear derailleur(GS) to use with maximum cassette sprocket of 36/40/42T
    • For MTB long cage rear derailleur(SGS) to use with maximum cassette sprocket of 50T
  • Improve smoothness during gear change after modification using sprocket extender.
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