Has anyone ever come across this issue of chain slap on the CF arm of their RD?
I have a Campy Record CT setup with a short arm RD. The whole system essentially works well, quiet and efficient. But when I am on the 19 or 21 rear cog (12-25 cassette with 50 at the front), I would get this repetitive tapping sound coming from the rear. The tapping noise disappears when I move to the 23 or 17 and beyond, where the system runs silent again. On close examination on a repair stand, I think I've identified the source of the mystery sound to be contacts b/n the chain and the CF arm of the RD.
I have tried to fine tune the cable tension/RD alignment without improvement.
So does anyone have any suggestion as to what the problem could be or how it might be corrected? I was wondering if the H screw setting has any relevance in this matter? As a matter of fact, what should be the criteria for setting the H screw?
Has anyone ever come across this issue of chain slap on the CF arm of their RD?
I have a Campy Record CT setup with a short arm RD. The whole system essentially works well, quiet and efficient. But when I am on the 19 or 21 rear cog (12-25 cassette with 50 at the front), I would get this repetitive tapping sound coming from the rear. The tapping noise disappears when I move to the 23 or 17 and beyond, where the system runs silent again. On close examination on a repair stand, I think I've identified the source of the mystery sound to be contacts b/n the chain and the CF arm of the RD.
I have tried to fine tune the cable tension/RD alignment without improvement.
So does anyone have any suggestion as to what the problem could be or how it might be corrected? I was wondering if the H screw setting has any relevance in this matter? As a matter of fact, what should be the criteria for setting the H screw?
Thanks in advance. --
Assuming you have a 10 speed setup, check if you have the spacers in the correct position. With 10 speed cassettes, at least on the Veloce- Mirage, there are 3 or 4 different spacers of about three different widths. On Centaur-Chorus-Record cassettes there are fewer spacers since some of the cogs are bolted together. But there are still a couple different widths of spacers. You may have a thinner spaceer where a thciker one needs to be. That is one nice thing about 9 speed Campagnolo, all the spacers are identical.
I think on the Campagnolo website you can find PDF tech documents that show the correct order of spacers.
Has anyone ever come across this issue of chain slap on the CF arm of their RD?
I have a Campy Record CT setup with a short arm RD. The whole system essentially works well, quiet and efficient. But when I am on the 19 or 21 rear cog (12-25 cassette with 50 at the front), I would get this repetitive tapping sound coming from the rear. The tapping noise disappears when I move to the 23 or 17 and beyond, where the system runs silent again. On close examination on a repair stand, I think I've identified the source of the mystery sound to be contacts b/n the chain and the CF arm of the RD.
I have tried to fine tune the cable tension/RD alignment without improvement.
So does anyone have any suggestion as to what the problem could be or how it might be corrected? I was wondering if the H screw setting has any relevance in this matter? As a matter of fact, what should be the criteria for setting the H screw?
Is the cog spacing even? A misplaced spacer perhaps? -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971
Has anyone ever come across this issue of chain slap on the CF arm of their RD?
I have a Campy Record CT setup with a short arm RD. The whole system essentially works well, quiet and efficient. But when I am on the 19 or 21 rear cog (12-25 cassette with 50 at the front), I would get this repetitive tapping sound coming from the rear. The tapping noise disappears when I move to the 23 or 17 and beyond, where the system runs silent again. On close examination on a repair stand, I think I've identified the source of the mystery sound to be contacts b/n the chain and the CF arm of the RD.
I have tried to fine tune the cable tension/RD alignment without improvement.
So does anyone have any suggestion as to what the problem could be or how it might be corrected? I was wondering if the H screw setting has any relevance in this matter? As a matter of fact, what should be the criteria for setting the H screw?
Thanks in advance. --
Assuming you have a 10 speed setup, check if you have the spacers in the correct position. With 10 speed cassettes, at least on the Veloce- Mirage, there are 3 or 4 different spacers of about three different widths. On Centaur-Chorus-Record cassettes there are fewer spacers since some of the cogs are bolted together. But there are still a couple different widths of spacers. You may have a thinner spaceer where a thciker one needs to be. That is one nice thing about 9 speed Campagnolo, all the spacers are identical.
That's a good thought that I should double check. I am 99.99% sure the various spacers were correctly placed in the cassette. I followed Campy's PDF document when I cleaned and reinstalled just two weeks ago. It's been the same situation before and after. Yes, it is a 10 speed setup. --
Has anyone ever come across this issue of chain slap on the CF arm of their RD?
I have a Campy Record CT setup with a short arm RD. The whole system essentially works well, quiet and efficient. But when I am on the 19 or 21 rear cog (12-25 cassette with 50 at the front), I would get this repetitive tapping sound coming from the rear. The tapping noise disappears when I move to the 23 or 17 and beyond, where the system runs silent again. On close examination on a repair stand, I think I've identified the source of the mystery sound to be contacts b/n the chain and the CF arm of the RD.
I have tried to fine tune the cable tension/RD alignment without improvement.
So does anyone have any suggestion as to what the problem could be or how it might be corrected? I was wondering if the H screw setting has any relevance in this matter? As a matter of fact, what should be the criteria for setting the H screw?
Is the cog spacing even? A misplaced spacer perhaps?
It is. The spacer possibility was raised and has now been eliminated. I've double checked and it's not the cause. The contact point appeared to be at the lower end next to the lower jockey wheel of the RD arm rather than at the upper end.
