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So I have XT shifters and XT shadow GS (medium) rear mech with a SLX 11/34 cassette.
That's the set up and the problem/issue is
Depending on where on the cassette if I do one click on the large lever the mech will not move so another click is required.
It's like it's only doing half a shift
The shifters a we're new 7ish months ago and the mech was second hand.
Please dont say Sram coz there worse IMHO
Anyone had similar problem?
It's an expensive way to check but new inner and outer cable might be worth a try. 9spd shimano pulls half as much cable per click as 10 spd (or sram!) and in my experience it doesn't take much drag/crud in the cables to clog the clbles to the point where you need an extra click up and then back down again to get to the sprocket you want.
Also check the derailleur hanger: a very slightly bent one will let you shift ok at one end of the caasette and not at the other depending on how you adjust cable tension. If you are able to 'move' your 2-clicks shifty problem up and down the cassette depending on how much you wing the barrel adjuster in and out, then my money is on this being the culprit.
Oh and have a look for excess wear or play in jockey wheels. (the top one on shimano derailleurs is supposed to have a little bit of lateral play built in from new though, iirc they have a patent on it.
a very slightly bent one will let you shift ok at one end of the caasette and not at the other depending on how you adjust cable tension
Thats the most likely imo (by a considerable way) - or less likely in your circumstances - a bent hanger.
Either cable or mech need replaced.
Almost certainly knackered cables.
"9spd shimano pulls half as much cable per click"
Is this an actual Science Fact? Best reason I've heard for 10 speed...
double post. I do want to know though.
Righty ho new cables it is.
Just about to click on some Jagwires of ebay. Has anyone got a bike to hand to measure the lengh of the rear.
its for a pitch and am guessing 2 metres for the rear and 1.5 for the front