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I am in the middle of converting my bike with road handlebar to a flat bar. The old road bar has a Shimano 105 brake/shifter and 105 derailleur. Something like this: https://www.mec.ca/en/product/5055-021/105-ST-5700-L-STI-2x10-Speed-Lever-Set

The bike is a 10 speed.

I bought some Tiagra Road flat bar shifters: SL-4700-R 10s and SL-4703-L

The Left hand SL-4703-L works perfectly. However, the SL-4700-R right side shifts up nicely for about 4 to 6 rings, and then skips a ring. Playing with the tension just changes which ring gets skipped.

I take it I screwed up and the new shifter is not compatible with the derailleur / cassette.

Is my only option to return the shifters and try to find something else?

Thanks!

Edit: Found a video -

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  • Had the same issue - lots of head scratching - get an 11 speed rear mech and all should be fine.
    – David Lapeš
    Commented Jul 1, 2020 at 13:04

1 Answer 1

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Correcto, unfortunately for you, the latest (4700) Tiagra system uses a different cable pull to previous 10-speed groupsets, therefore the shifters are pulling the wrong amount of cable for your derailleur. It won't get better, however much you change the tension.

You could get a new 4700 derailleur, which would match the shifter and work with the existing cassette, keeping the flat bar.

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  • 4
    Tiagra 4700 strikes again!
    – Argenti Apparatus
    Commented Apr 12, 2020 at 21:57
  • Tiagra 4700 derailleurs are reasonably priced, too. Especially so in the used market or new take- offs.
    – Jeff
    Commented Apr 13, 2020 at 11:57
  • Or get a 105 11 speed rear mech for a couple of quid more
    – David Lapeš
    Commented Jul 1, 2020 at 13:03

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