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My Chorus 9 Speed Ergo-power (~2005) got inaccurate during shifting. The local bike repairman couldn't get the dérailleur to shift properly.

Sometimes the chain don't jump down or up after shifting. Some gears are skipped and the pressure points got weak.

What parts do I need to replace? Is it maybe a better idea to replace the whole Shifters with a available new 9 Speed Ergopower like the Xenon?

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The Ergopower shifters have a part called G spring that eventually wears out. The symptoms are inaccurate shifting and less sharp clicks, just as you are experiencing. The part is still available, not expensive and relatively easy to change.

I would not replace the shifters with Xenon, as it is generally much lower quality and doesn't allow downshifting multiple cogs at a time like other 2000s Ergopowers.

  • Are there other parts which I should replace too? – Penta Jun 24 '15 at 12:24
  • Cables and maybe cable housings. New cables shift better and reinstalling old ones after removing levers for disassembly is next to impossible anyway. The click disc can be replaced too, but in my experience it does't wear out nearly as fast as G-springs. – ojs Jun 26 '15 at 18:54
  • I replaced the G Spring and the G Spring carrier. Now the shifting has sharp clicks. But it is shifting still inaccurate. – Penta Aug 10 '15 at 17:42
  • The next things to do are readjusting the derailleur including B-tension, switching to new cassette and chain, and replacing the cables and cable housings. – ojs Aug 10 '15 at 18:58
  • Everything is new except the ergopower and derailleur. – Penta Aug 10 '15 at 19:06

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