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Use high and low screws to set limits.....but how to ensure perfect cable tension and shifting?
Have a look here [url= http://techdocs.shimano.com/techdocs/blevel.jsp;jsessionid=mm2nQDJZGPJFgMQQp2Vn1MFLMJnfT1cD4qGDK7jCy1cNQJRv2z8z!1054269558?ASSORTMENT%3C%3East_id=1408474395181679&FOLDER%3C%3Efolder_id=2534374302051947&bmUID=jIg15GM ]Shimano[/url]
Find the correct mech and follow the instructions - can't go wrong
In addition to shimano instructions check out this :
http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur
I have spent more hrs than I care to remember setting up my rear indexing! They key I find is to obviously set limit screws first.... Don't forget the b screw adjustment - can make things sound like a bag of spanners if not set correctly (too close to gear).
Best way to check cable tension I have found is surprise surprise as per the shimano guide (admittedly the way it's written is crap). Stick chain on second gear in rear and then apply a tiny bit of tension via the shifter just enough to take up the play in the cable. You want to adjust the tensioner screw (anti clockwise = more tension) until you start to hear the chain picking up on the third gear.
Indexing with 10 speed systems can be a bit of a fiddle as quarter turn on the tensioner can make a difference between good/poor performance! Also with the flex in most full suspension rear ends - the gears may shift and sound fine in the stand BUT as soon as you get some power down while riding things change! The best way is to adjust as best you can in the stand and then adjust a little at a time during a test ride.