Campag 10 speed question

[NeilM]

I popped the chain on my latest build today, ready to tune up the front and back mechs, and almost immediately ran into problems.

The set up is Campag 10 speed, with Chorus F&R mechs and Centaur shifters.

The shifters are from around 2007 and the rear mech is a Chorus medium cage.

The problem I have appears to be with pull ratio and also with the end stops on the mech.

First; even with the end stops adjusted to their extremes, I cannot stop the chain dropping off the smallest cog and into the gap between the axle and frame. At the other end of the cassette the stop screw needs to be fully withdrawn to allow me to get onto the biggest cog.

It is almost as if the mech is very slightly too far out from the frame, although from what I can see, it is correctly mounted and there is no visible gap between the mech and the droput. I have also given the dropout a good look and it is straight.

Second; even with the stop screws set at these extremes, I cannot select the largest cog with the shifter, as I run out of cable pull, with the arm that the cable clamps to almost on the point of impacting the point where the cable comes through the mech.

This I assume is because there is a difference in pull ration between the shifter and mech. I will pull the mech off tomorrow and see if I can find a part number.

Any of you Campag experts care to offer a guiding hand to a confused mechanic. :facepalm:

 

[chipper]

Anything other than a proper Campag cassette can cause problems , also hub spacing might be out i.e cassette to far away from dropout

 

[agentorange]

I cannot stop the chain dropping off the smallest cog and into the gap between the axle and frame.

You shouldn't have enough space in this gap for your chain to sit, I wager this 'may' be your issue. Easily fixed with spacers but probably worth checking wheel centering first though previous owner may have dished the wheel to suit.

 

[NeilM]

Re:

I've been thinking about this overnight and I think you're right agentorange.

Every other bike I've set up, the small cog of the cassette is very tight to the dropout and on these wheels (Mavic ksyrium), there is a gap. I was fooled by the fact the wheel is dead centre in the frame.

The cassette is a genuine Campagnolo, as I don't know enough about Campag compatibility to mix'n'match.

Looks like I'm playing spacers and redishing over the weekend then.

 

[Mike Muz]

Re:

Hi Neil ,
Never had Campag , but it sounds like the freehub needs moving over towards the drop out . I'm guessing that you can't move the wheel across the axle ? Could this be the Rossin we're talking about ?
Mike

 

[Rev Cannon Dale]

Re:

I've been thinking about this overnight and I think you're right agentorange.

Every other bike I've set up, the small cog of the cassette is very tight to the dropout and on these wheels (Mavic ksyrium), there is a gap. I was fooled by the fact the wheel is dead centre in the frame.

The cassette is a genuine Campagnolo, as I don't know enough about Campag compatibility to mix'n'match.

Looks like I'm playing spacers and redishing over the weekend then.

Redishing the wheel does nothing at this point.
All that does is move the rim across in relation to the centreline of the hub.
Likewise, moving the hub across the axle (even if its possible) is unlikely to achieve anything.
Furthest inboard freehub i've come across is a hope pro3 .
As you say its a ksyrium, has it been converted from shimano at some point and you're missing a spacer?


Its doubtful that there's a compatibility problem going on here. I've run and set up all sorts of configs over the years.
I have seen the odd steel frame where the hanger position makes it difficult to set up.Whether thats a chainstay length problem as well, IDK

 

[pigman]

Re:

I would say its an axle problem. Someone has taken spacers from the left side and inserted into the right so the hub is not aligned within the dropouts as it should be. If I'm right, then this is your first fix - the second is wheel dish. As Rev pointed out, this is moving the rim to align centrally in the frame.

It would seem someone has made a bodge of it - they've set the hub spacing wrong and dished to suit the wrongness in the hub.

I would question the wheel history - has it been rebuilt and to what standard. Ksyriums are factory built with nothing other than the occassional minor truing up required.

 

[NeilM]

Re:

All fixed with a few strokes of a file.

It was mentions of spacers and axles that did it... plus some daylight helped.

It would appear that in transit the very end of the axle, on the drive side, had acquired enough of a burr to prevent it locating in the dropout properly.

So it was in the dropout (just), but there was a 5mm gap between the frame and the cassette, which I really should have spotted straight away, especially when the chain dropped off.

Anyway, all fixed now, and a lesson learned.

Mike; we are not talking Rossin, but we could be talking Basso.

 

[Mike Muz]

Re:

Ah yes that'll be the one
On the lookout for a nice frame myself actually , having realized the Waugh is just too big for me . '90s steel , 57 x57 with maybe some nice chrome to polish . Pinarello , Merckx , De Rosa , Bianchi , something like that
Glad you sorted out the problem mate

Mike

 

[NeilM]

Re:

Mike; as you know, I have a soft spot for British builders, so I'd be looking in that direction too.

Plenty to choose from and some at real bargain prices, in all the usual places.