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Had a slight issue with my other half's NRS ever since I built it.
Basically, it shifted fine throughout the cassette but always had trouble falling into 9th gear. So it shifted OK once you had clicked up the cassette twice from 9th.
The old XT mech I had on there had some play at the main pivot, and also the shifters felt pretty horrible, so I've just fitted some nearly new XT M770 shifters and a good condition XT M761 rear mech. Cable are recent Clarks Pre-lube.
Set the gears up, then a friend of mine borrowed it at weekend. He said gears were OK, but often needed doule shifting, i.e. up two gears, down one, to move up a gear.
I've just been out on it this morning and it's basically the same as it was, very slow, if at all, changing up into 9th.
Generally it is OK at the lower end of the cassette, but as you get towards the higher gears is worse. The best I had it fiddling around with cable tension was that it would change up, but a good while after you had shifted. Mech is moving fine.
Any ideas? Only thing I'm thinking, the NRS frame wants you to run the cables down the same side of the bike as the shifters, but I always like to route them the opposite side, to give a smoother arc from shifers and avoid cable rub.
Trouble is, on this frame it means it does mean a bit of tight kink getting the rear cable into the first boss on the top tube.
I'm tempted to try a full outer just tiewrapped to the frame to see if it solves the issue. I know full outer is best for keeping dirt out of the cables, but does it cause any issues in it's own right with excess cable drag?
Other than that, does it sound like I'm being a numpty and missing something??
Sounds highly likely that it is the cables. Would also be worth checking the alignment of the mech hanger.
Sounds like it might be the limiting screw on the rear mech makes it go too far out so this might be the reason why it goes ok into 9 but You need to put two up to go a gear up. Try playing with that first. Unscrew the cable, the mech will go down into 9, than use a screwdriver and screw in the limiting screw so that the mech moves to the left a bit but the chain stil stays on 9. Put the cable back on, get it tensioned just right, not too much (leave some adjustment on the barrel adjuster on the shifter) and see if that makes it shift as it should.
I once had issues when the outer to the rear mech was too short. Caused similar problemss.
Went for a longer outer (and put on XTR cables) and it is now sweet as anything. I know XTR cables aren't the cheapest, but I haven't had any issues for about 2 months now.
I would check that none of the bends are too tight
I assume you have checked the cassette is fitted properly and their is not too much play in the freewheel?
I'd go for cables, had some ??? (cant remember their name, used to make canti brake pads, began with 'A') cables on my enduro and they just wouldnt work properly, binned them and put XTR, problem solved.
Aztec cables! Avoid
Cheers for the tips.
I'm 99% sure the h limit is fine, I've set up two mechs on this frame now, always the same, no cable tension, pull cable to shift down, let it go, tighten screw until it just skips off of top gear, then back it off 1/4 turn.
cassette is tight, but freehub is not great. Worth a try anyway, I'll try another rear wheel from other bike first, before trying new cables.