Veloce B tension adjust?

[Ant]

Does anyone know how to do this?

I threw the chain off my bike recently and for some reason the rear derailleur was affected. When in the lowest gear the chain rides on the lower jockey wheel and vibrates slightly.

Several bike mechanics have said that the 'B Tensioner' needs adjusting, and sure enough, if you pull the derailleur back slightly the problem is gone. However, Campagnolo Veloce does not appear to have this adjustor and everyone that's looked at it have just stood scratching their heads.

Anyone have any idea how this is done on Campag Veloce 2009?

 

[Will1985]

B-tension is a Shimano thing. I refer you to the gospel of Sheldon:

Loosening the "a tension" has the same effect as tightening the "b tension.

 

[Ant]

thanks, but I'm still none the wiser...it doesn't seem to have an A tension either.

 

[Will1985]

It is the barrel adjuster where the cable enters the mech.

 

[Will1985]

Just had a thought - how old is the chain? Could it be stretched?

 

[Ant]

It is the barrel adjuster where the cable enters the mech.

No that's not it. That's for adjusting the indexing. This is in a different direction.

Just had a thought - how old is the chain? Could it be stretched?

It's only three months old, and I've only done a few hundred miles on it. Not especially hard ones either. It's a proper campag one too, so not cheap cr@p

 

[Joe24]

It's only three months old, and I've only done a few hundred miles on it. Not especially hard ones either. It's a proper campag one too, so not cheap cr@p

I used to wear out 8 speed ones in a month, but i was doing about 1000miles. But if you havent done many miles then its probably not that.

Cant help on the adjustment, ive only ever worked on Shimano/fixed so dont know about it.

 

[HLaB]

I've never done it before but according to zinn, campy have done away with the b screw (as you know) and adjustment is instead done through

an external screw engaging a number of external teeth around the base of the rear derailleur's lower pivot.

 

[youngoldbloke]

Are you looking for the 'H' screw? - see http://www.campagnolo.com/repository/documenti/en/7225432 - Rear derailleur 9-10s-03-08.pdf
- next to the jockey wheels cage. It moves the cage in relation to the cogs.
(see also http://www.parktool.com/repair/readhowto.asp?id=64)

- not to be confused with the H screw of the H/L pair of course, which Campag refer to as B and G in the RD leaflet!

 

[Ant]

Thanks for the info guys, particularly the links.

I haven't had a chance over the weekend, but I'll take another look at it this evening and see if I can figure it out.

 

[Ant]

Sorted. H-Screw adjust anti-clockwise

Thanks for the help

 

[Ant]

On the downside I've just noticed that the rear derailleur cable is slightly frayed from the chain catching it, and will need replaced.

How easy is this to do? I can't see any easy access to the anchor points under the brake hoods. Will I need to take the brake hoods apart?

 

[youngoldbloke]

I knew about the H screw due to a problem that needed sorting in my Veloce set up. I haven't had to touch the cables as yet, but my first thought would be to go to the Campag website and look at the information there. I think it may depend on exactly which shifters you have, but for example http://www.campagnolo.com/repository/documenti/en/7225251_Ergopower_0307.pdf

 

[Ant]

Yeah, those are the ones. I think I'm going to phone around and get an LBS to sort this properly.

I can't believe the grief that a thrown chain has caused Even more annoying as I tried to get a dog fang a wee while ago but couldn't get one the right size, so gave up

Thanks again for your help.