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I have a bike that was built with 10 Speed Campagnolo Veloce Shifters, 9 speed Veloce rear derailleur, and SRAM 9 speed cassette and chain.

I found a page on the builder's website that states they do this on purpose and that with proper cable adjustment, it works.

I've spent hours trying to get the adjustment right but some gears always slip from the indexing being off.

Thanks!

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  • The easiest answer is to keep everything in the same brand and groupset. The rear shifter probably won't care, but it may expect a different cable pull.
    – Criggie ♦
    Jul 4, 2016 at 22:52
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    Thanks for your response. I'm not changing any parts. These are the stock parts so I know this setup worked at one time. I'm simply wanting to adjust the cable in such a way that the 10th index is past the biggest cog but the other index positions are spot on so all the cogs on the cassette work. Please let me know if there's easier ways to communicate about this, I've been having a hard time finding good info.
    – Jere
    Jul 4, 2016 at 23:19
  • Do you know that the setup worked only because they are the stock parts? Or do you have first hand experience that it actually worked.
    – Kaz
    Jul 5, 2016 at 3:31
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    I'm surprised they mixed the speeds like that. Did the bike also come with instructions not to use the first/last gear on the shifter?
    – PeteH
    Jul 5, 2016 at 7:24
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    Extra position on the shifter is never the/a problem and read herring in this case. Tune the Dérailleur High/Low screws and the shifter cannot reach it.
    – mattnz
    Jul 5, 2016 at 23:14

1 Answer 1

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Not entirely surprised you have problems refer here...

According to this link, Cable Pull for a Campy 10 shifter is 2.8mm, dérailleur ratio for a Campy is 1.5 (or 1.4 for old) Cassette sprocket pitch for SRam 9 is 4.35.

So a single shift on the the 10speed is 2.8*1.5 = 4.2mm (ideal is 4.35). Over a 9 speeds that an error of 1.35mm, so when tuning, you will end up with about 0.7mm error on the outer cogs - i.e. it will never be able to be tuned perfectly, but when everything is new and shiny, will work surprisingly well. As things get less new and shiny, this error means tuning become more and more difficult.

The fix would be installed a Campy 9 speed shifter or a 10 Speed cassette and chain.

Edit: Another page on compatibility here lead me to This adapter (Shiftmate) or similar might be the answer you are looking for. They specifically list a Campy 10 shifter to Shimno 9 (Sram and Shitmano 9 speed are the same).

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  • Thanks! Would you please repost the link? It's linking to this question currently. I wouldn't necessarily mind getting a 10 Speed cassette and chain as I'd like some different gears anyway but would I need a 10 speed derailleur also?
    – Jere
    Jul 5, 2016 at 2:45
  • Is it not possible to push this error to the 10th cog (that isn't there)?
    – Jere
    Jul 5, 2016 at 2:58
  • 1.35mm is a lot. In my experience, a quarter turn of a barrel cable adjuster can sometimes make quite a difference in shifting: like from instant to a delay of a few seconds.
    – Kaz
    Jul 5, 2016 at 3:33
  • Thanks, I've been considering the shiftmate and I think that's what I'll do if the builder's instructions don't work for me.
    – Jere
    Jul 6, 2016 at 3:33

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