rear derailer help needed - 105 gs or ss?

chris_bass

Hi

i've been reliably informed my rear derailer is knackered!

i'm running shimano 105, what is the difference between gs and ss? and how do i know which i need?

any help would be great

jermas

SS is short cage.
GS is long/medium cage.

SS is for normal double chainset (standard or compact) gear setup. GS for triple chainset.

chris_bass

Ah, i see! Thanks, I have a triple so will go for the gs