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I have a 2000 Klein Quantum (this one, 2x9 speed: https://www.bicyclebluebook.com/value-guide/product/45657/) My shifters have been replaced once already with used 105 (also 5500), but now they have a lot of issues and I would slowly like to upgrade the whole groupset.

Can I start by switching out the shifters and derailers with new Sora R3000 parts (also 9 speed)? Or would I have issues with the brakes/crankset/etc? This would put me back on the road while I save for the rest. Thanks for any help, this is my first time here.

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Can I start by switching out the shifters and derailers with new Sora R3000 parts (also 9 speed)?

All Shimano 9-speed parts use the same derailleur pull ratio (except the front derailleur pull ratio can vary between MTB / road components). Thus, you don't even need to change the derailleur, just changing the shifters is enough.

The STI levers are short-pull levers compatible with any cantilever or caliper brake. They are not compatible with V-brakes. As your old STI shifter/levers were short-pull too, no changes there.

Just be sure to select the Sora 2x9 parts instead of going for Sora 3x9 parts.

I'm not sure what issues you have but as the STI levers are expensive, please be sure to eliminate the possibility of issues coming from some other parts first. Perhaps your bike needs new inner and outer cables instead of needing new shifters?

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  • "All Shimano 9-speed parts use the same derailleur pull ratio" That is only true for the 9 speeds at the rear, not those 2 speeds at the front.
    – Vladimir F
    Dec 27 '20 at 19:21
  • Notably, there is no compatibility between Sora 3000 and Sora 3500 FD and ST in productinfo.shimano.com/download/?path=pdfs/archive/…
    – Vladimir F
    Dec 27 '20 at 19:27
  • juhist, thank you! My list shifter hasn't been working for years and I haven't been able to fix it. Until recently I have only used the right to shift up and down with the rear derailer, but it jamed a few days ago. I might be able to fix the right one, or adjust the derailer, but I also want to upgrade.
    – Milchman
    Dec 27 '20 at 20:19
  • Vladimir F, Thank you for the clarification. I may buy the levers first and see how it goes.
    – Milchman
    Dec 27 '20 at 20:24
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    @Milchman what he means is that if you get the Sora shifters, you should get a new front derailleur at the same time. People give some strange answers on here.
    – JoeK
    Jan 26 at 21:30
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You can replace your rear shifter by a Sora 3000 one. However, you CANNOT simply replace your front shifter with a Sora 3000 one unless you also change the front derailleur.

The front derailleur cable pull ratio has changed. You need some older type, such as Sora 3500. You can verify the compatibility on the Shimano website https://productinfo.shimano.com/download/?path=pdfs/archive/2017-2018_Compatibility_v030_en.pdf (and other older or more recent version of your liking).

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    He could also replace the front derailleur, it's not like they're expensive. So yes hecan; he needs shifters and a front derailleur
    – JoeK
    Jan 26 at 21:29
  • Sure, I think the point was clear.
    – Vladimir F
    Jan 26 at 21:42

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