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Shimano Ultegra 10-Speed RD-6600 GS Long Cage Rear Derailleur 20 Shim Ult
$93.99

2005 Shimano Ultegra 10-Speed RD-6600 GS Long Cage Rear Derailleur

Weight: 219.0g

The Ultegra 10-Speed RD-6600 GS Long Cage rear derailleur has the same technology as the Short Cage version, but the distance between its pulleys is a bit greater (hence the name "Long Cage") in order to accomodate the needs of a triple drivetrain.  The only circumstance in which you need this derailleur is if you're running a triple cranket.  If you're running a double crankset (even if it's 50/34 compact, and even you're using a 12-27 cassette), you use the Short Cage rear derailleur.
 
 
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