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-   -   Shifting.... (https://www.bikeforums.net/mountain-biking/31808-shifting.html)

a2psyklnut 07-16-03 10:01 PM

When you are in the largest cog, if you notice the upper jockey pulley dragging on the cog, turn clockwise. This will increase tension and eleviate it rubbing the cog. What it does it changes the effective position of the derailleur and pushes (pulls? rotates?) it back further to avoid.

Think of two tangential circles stacked and meeting. You are moving the center of the lower circle down and back, causing the tangential points to seperate.

Does that make sense. After I read it again, it doesn't to me either, but at lease I know what it does. Can't explain it, but I know!

L8R

a2psyklnut 07-16-03 10:04 PM

hey trek, do me a favor.

Shift your bike into the middle chainring and the smallest cog. Take a picture of this directly from the rear. I want to see the vertical alignment.

Now, without adjusting anything. Shift into the big cog and take another pic. at the same angle.

Methinks your derailleur hanger is STILL bent. If it's shifting well in the lower (smaller) half of the cassette, but hangs up in the upper half, that's usually a good indication.

L8R

Trek6500ZX 07-16-03 11:18 PM

1 Attachment(s)
Here's the first I hope it's at the angle you wanted, if it isn't let me know and i'll take more:

Trek6500ZX 07-16-03 11:35 PM

1 Attachment(s)
Here's it in the biggest cog, I thought the bigger picture size would help:

a2psyklnut 07-17-03 10:10 AM

From the pic of the first one, things look spot on regarding your stop setting. I'm not sure, maybe someone else can provide their opinion, but it appears from looking at the lower jockey pulley that there may be a slight counter-clockwise twist to your derailleur. The lower jockey pulley seems a bit "outbound".

I can't tell from the second pic., and that's my fault. I didn't clarify.

I need to look at it directly from the rear so I can check the vertical alignment.

Your second photo is too much of a side view.

Thanks
L8R

Trek6500ZX 07-17-03 10:20 AM

alright, let me take another and i'll post it, it's just hard to balance the bike and take the picture at the same time.

Trek6500ZX 07-17-03 10:42 AM

1 Attachment(s)
How's this? lol i'm not sure if thats what you want, let me know.

a2psyklnut 07-17-03 10:54 AM

Yep, that's what I needed. It appears to be lining up correctly.

Is the slow shifting only from 7th to 6th or is it all the way through the gears?

Try turning the barrel adjuster IN (clockwise) a little, like 1/8 of a turn and see if that helps.

L8R

Trek6500ZX 07-17-03 11:02 AM

When I turn it all the way in and then turn it out 1 turn like you said before it won't allow me to shift into the biggest cog. Should I just keep turning it out until it allows me to shift into the biggest cog? Should I make any adjustments to my B-Screw? Thanks

a2psyklnut 07-18-03 08:16 AM

Shift into the smallest cog, then turn it all the way in and back out. Then, set the cable tension. I just pull the cable snug with my hand and then tighten it down.

Shift once, and turn barrel adj out until it "climbs" into 3rd gear then back in just to the point where it stops "climbing" onto 3. If you look at the derailleur it should be lined up directly under the 2nd cog.

Then shift through the gears. If it won't go into 7th, but does in all the others, try unscrewing the limit screw a tiny bit. 1/8 - 1/4 turn.

Go through the gears again, (many times) and see how that works. Remember, small turns of the barrel adjuster (max 1/4 turns).

L8R


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