Thread: Difference between Shimano Rear Derailleur 105 SS & GS
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Old 09-01-11 | 03:46 PM
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cmill189
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Joined: Apr 2010
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From: Salt Lake

Bikes: 2006 Fuji Roubaix SL, 1983 Peugeot P12

GS is a mid/long cage, SS is a short cage.

The gearing on your bike will determine which you need, the difference between your largest and smallest chain ring added with the difference between your largest and smallest cog.
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