SJX426 

I have an 8V block (DA with proper spacing) with a 9V Chorus RD and 10V crank set.
The issue is the chain walks off the bottom jockey wheel toward the center of the bike in the two smallest sprockets even with the chain on the large ring.
There is also a potential of the same problem on the largest sprocket but with the chain walking off away from the center of the bike.
My thinking is the chain is too small and should be replaced with a 8/9V chain.
I did replace the jockey wheels with the issue remaining.

rccardr 

What’s doing the shifting?

dsbrantjr

How is the rear derailleur/hanger alignment?

Iride01

Are we talking about a Volkswagon engine or something? I've just never seen 8v or 10v or anything 'v' used to describe a cassette or something on a bike.

But admittedly I haven't seen everything.

ShannonM

I've seen "#V" used as an abbreviation for "#-speed" a few times. I've always assumed that the "V" stands for "vitesse", French for "speed". It's actually a kinda useful shorthand, but it never caught on.

--Shannon

SJX426 

!. Doesn't matter what is doing the shifting.
2. "v" used to denote speed. BTW "a" denotes acceleration.

JoeTBM 

This ^^^^^^ !!!

Iride01

I normally buy the chain for the number of speeds on the rear. So trying a 8 or 9 speed chain might be the thing.

Were the Jockey and pulley wheels replaced with wheels for a 9 speed Chorus RD or are they mix and match also?

However, the big thing I'd be checking is if the hangar is bent. I just seems like an odd problem and bent hangars cause odd problems.

SJX426 

Hanger was checked and minor alignment made but still have the same issue.
Jockey wheels were replaced with VO 10t. the original jockey wheels are still good, but have the same problem, hence the replacement.
Chain line was checked too.

Iride01

Did you check that they don't have a specific rotation direction. Some pulley/jockey wheels have arrows on them.

Still, that's an odd issue.

70sSanO

This is what is disconcerting. Having an issue with the first & second position cogs is most likely a chain angle issue. Whether a twisted derailleur cage or a really bad crankset chainline, there is potential to solve this. But when it appears to be close to occurring at the other end of the cassette at the same time, that really complicates things.

I can't speak for Campagnolo, but for a similar menagerie, the preferred setup I have used is 8 speed block (cassette), 9 speed rear derailleur, 10 speed crank with a 9 speed chain. I have not had any problems with this drivetrain, even when running a triple.

As for your situation, it is probably safe to say that you rear hub is set at 130mm. We don't know the type of bike being used nor the wheel size. My first thought was possibly a bike with extremely short chainstays since there is potential for issues at both ends of the cassette.

If it were me, I'd swap out the Chorus derailleur with something else to see if you still have a problem. If you have friction shifters, use them. It will be pretty obvious if the same problem exists with a different rear derailleur. All you want to do is eliminate potential problems one at a time.

John

SJX426 

@70sSanO - thanks for your reply on topic!
My thoughts exactly about both ends of the range being an issue.
I will search my stash for an 8v chain to try out.
Pinarello Montello 1992ish. 130mm OAL, 700c wheels. Yup likely short chain stays. Ergos.
CConversion95 on Flickr
Campagnolo first install on Flickr

I had some issues with crank set at one point but it was all due to user ignorance. The right BB matched to the crank set solved the problem and I believe the chain line is good.

I might put the DA RD on and try it out. I am also going to measure the width of the new vs old jockey wheels at the cage interface.
I was wondering about the cage being twisted but with the issue on the other end of the range...... OH! I bet the issue with the largest sprocket is due to cross-chaining!

Yup, cross-chaining was the issue on the largest sprocket in the back.
I also twisted the bottom of the cage ever so slightly by using an Alan wrench in the jockey wheel screw and holding the upper part to cause the twist between the jockey wheels.

I have a few hundred miles since converting to the Campagnolo drive train (new wheel to finish it off with Record hub and some Campagnolo cassette (not record)). Used Wheel Mfg spacers on the DA cassette and hub.
I thought I the system was not subject to cross-chaining issues. I was in error.

All good now.

SJX426 

The Campagnolo jockeys have an upper and lower with one identified with direction, lower one IIRC.

70sSanO

Nice bike. Glad it worked out.

You sir, have a very nice stable.

John

SJX426 

Thanks, It is all with original Patina!
The bucket list is not fulfilled!