Rear Mech - need some advice PLEASE
Turns our the the rear Mech I bought is different to the one I currently have on my other bike - shud hv checked before I bought.
On my first bike I have an XT which is the the one that when the cable tension is increased the chain is moved inwards towards the larger cogs. The new XT one I bought is reverse to that, i.e increasing cable tension moves chain to the outside, smaller cogs.
So now I know there are different types of XT derailleur - is one better for shifting that the other or is simply preference ?
If it is preference I will stick with the one I am used to, therefore, what is XT type called that moves the chain inwards when tension is increased.
Also, how do I know if I need a long or short cage for the new bike I am putting together ?