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What size rear derailleur?

Phonk7Phonk7 Posts: 178
edited December 2009 in MTB general
H,i buying a new shimano xt shadow for my trance X3 (08) and due to my very small brain am stumped at what size to buy. When i look at chain reaction cycles it offers 3 different types of the same derailleur, small medium and large, which one do i pick ! :? is there a formula sort of thing to work out what size i need? thanks

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