Join Date: Apr 2007
Location: Munising, Michigan, USA
Bikes: Priority Bicycles Eight
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Originally Posted by gtpro
I will prefer the original spec that came with the bike which was a medium cage derailleur.
Don't obsess about things like that. Life is too short. You got an X4 on that bike because the manufacturer specified it to meet a price point. That's all. If an X5 is easier to get, then I'd grab an X5 and be done w/it. Otherwise, you can go nuts sometimes trying to source a specific part that may not even be made anymore.
I did take a look at the specs on sram.com. The inner cage on the X4 is made from "composite" material. In other words, it's plastic. The inner cage on the X5 is steel. Me, I'd go w/steel.
The X5 can also handle a nine-speed cassette. That probably does not matter to you. But it matters to those of us who are frequently tearing down one frame to build up another.
BTW, are you familiar w/derailleur adjustment? If not, it may be easier for you to just buy a derailleur at a shop and pay them to install it.