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Old 09-08-04, 06:42 AM   #1
BigHit-Maniac
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XT rear Derailleur adjustment(s).

Oooookie doookie... having some XT issues here.

Anyone that can help is MUCHO appriciated.



So I have an XT Mid-cage rear derailleur on my Demo 9. I have it mated with an LX shifter, full length housing, and an Avid Rollamajig (correctly setup ).

Anyway, I can get it to upshift nice and crispy and smooth, but towards the bottom of the downshifts (going from like 2-5 through 2-9) it just clunks/slams into gear, and then towards 2-9 hesitates big-time to go into gear. I figured this would mean too much cable tension, so I took out a little tension, and the same thing happens.. except it won't upshift smooth anymore.
So.. what adjustment(s) should I make so it'll shift down as smooth as up? My cable is brand new, as is the housing. It's been Tri-Flowed, and is clean with no crapola all over it. So the cable is not snagging (it slides smoothly in the housing).

Anyway, any help is appriciated... as I'm getting a little frustrated with this thing. I'm usually ok at adjustments.. but this one's got me stumped. (and no the derailleur hanger isn't bent! it's too beefy).

-Matt
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Old 09-08-04, 06:51 AM   #2
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when you say 9, you mean the biggest sproket or the smallest? if its the biggest, it could be chain length.
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Old 09-08-04, 06:59 AM   #3
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Quote:
Originally Posted by BigHit-Maniac
Anyway, any help is appriciated... as I'm getting a little frustrated with this thing. I'm usually ok at adjustments.. but this one's got me stumped. (and no the derailleur hanger isn't bent! it's too beefy).

-Matt

I hate to say this, but I think your derailleur hanger is bent. What you've described is typical for a bent hanger. Just because it's beefy doesn't mean a big hit didn't tweak it a bit.

L8R
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Old 09-08-04, 11:42 AM   #4
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Quote:
Originally Posted by Phatman
when you say 9, you mean the biggest sproket or the smallest? if its the biggest, it could be chain length.
I mean the smallest ring in the back.


It'll hardly shift onto that ring.



Also, as far as a bent derailleur hanger.. I dunno if it IS possible with a Demo 9 to get the hanger to bend... as it has that piece that goes over the derailleur where it screws on. I'll post a picture when I get home... so you can see what I mean. The hanger and the protector are uber beefy...

Hmm... oh well.. I guess I'll just keep figiting with it.

Any other help is appriciated.

Thanks guys.

-Matt
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Old 09-08-04, 02:37 PM   #5
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Have u tried pre-stressing the cables? If they're new then sometimes it takes a little while for them to stretch and reach their correct length. During this break-in period, shifting performance suffers ... and if they weren't pre-stressed during installation, it suffers to a point where you can't shift through multiple gears.

Also, check your limit screws as far as the H screw goes ...
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Old 09-08-04, 02:41 PM   #6
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Originally Posted by a2psyklnut
I hate to say this, but I think your derailleur hanger is bent. What you've described is typical for a bent hanger. Just because it's beefy doesn't mean a big hit didn't tweak it a bit. L8R
I agree. A bicycle is a simple machine. Whenever I have a problem that seems to defy logic, my first reaction is to start at the beginning and make sure that everything is in the default mode. This procedure has never failed me. In this case, that would mean checking the derailleur hanger alignment. If the hanger alignment is wrong, then the derailleur is hanging at an angle to the cassette and no amount of tuneing is going to make it shift reliably.
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Old 09-08-04, 05:03 PM   #7
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Aighty. Thanks guys.

I'll take er' to the shop, and slap an alignment gauge on it.

-Matt
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Old 09-09-04, 07:24 AM   #8
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Well, I wound up not being able to take it to the shop, for a few reasons... .. but I did manage to get it to at least shift into the smallest rear cog. I adjusted the derailleur stop just a smidge further towards the stay, which allowed the chain to be pulled a little farther. This seems to work, and doesn't make the "ticking" noise it makes if it wanted to shift any further, dropping the chain...

I still wanna' check the derailleur hanger alignment.. and I guess I'll have to get to that when possible.

-Matt
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