3

2, 3 transfer correctly

enter image description here

1 - not correctly.

enter image description here

transfer switches normally. But the index does not become 1 in the box.I do not even remember how it happened. The effort did not make. How can I fix it?

add

2
  • 1
    Sounds like your FD's stop screw is a bit slack and allowing the cable to be pulled further through? Does the shifter go over 1 and the past it or does it never get to 1 ?
    – Criggie
    Aug 4, 2016 at 9:32
  • after 3 drum rotates above. and to transfer 1 no. Even in an effort to transfer 1 does not reach the window. Aug 4, 2016 at 9:46

3 Answers 3

3

I'm guessing your cable is immensely too long, and its only by chance that numbers 2 and 3 line up with a gear.

Try putting it on the smallest front chainring, then back off the cable pinch bolt.

Set the handgrip shifter to 1 and pull all the cable slack through, and do up the pinch bolt.

Some tweaking may be required.

1
  • with a force index 1 is not twisted to the window. in any way. I think that jumped gear. Aug 4, 2016 at 10:48
2

Guys thanks for all the tips. I took apart the switch and put as it is necessary. Now switch works as it is necessary. It remains to hang him on a bicycle. Yes, in this version of the switch all the gear and guides. Thank you! P.S. This is my first bike, the best budget.

enter image description here

3
  • 1
    Great work - thank you for the closure. Personally I can't see the number on my 6 speed revoshift folder, so I ride by feel :)
    – Criggie
    Aug 5, 2016 at 0:16
  • I think that you have a similar situation. I jump gear. It is on switch operation is not affected. But I decided to investigate. Aug 5, 2016 at 8:04
  • 5 years later, I have the same issue on a revoshift left side index 3 speed sl-rs36 not showing 1 in the display-box. Could you elaborate on the steps you took to fix it? You talk about "switch" but doesn't make much sense.
    – Rwave
    Jun 6, 2021 at 3:35
1

I'm not exactly sure how that Revoshift works and I will likely never get a chance to get my hands on such a low-end thing to take it apart.

The trigger-type shifters with a needle display have an internal spring which forces the indicator needle to go to the 1 even if the cable tension is completely slack. If that spring breaks, then they will not go to 1.

Perhaps your barrel shifter works similarly.

It is not unusual for the cable tension to be completely slack on the lowest front ring. That is simply because the index position is farther than necessary; the actual movement of the derailleur is trimmed with the "L" screw. You can see this clearly in the assymetry of the typical shifter display, which looks a little like this:

3   2       1
      ^^^^^^  extra distance between 2 and 1

So that is to say, when you shift to "1", the cable becomes quite slack. The front derailleur wants to move, under its own spring tension, much farther than necessary, and will happily dislocate the chain off the small ring: what stops the derailleur from moving too far inward isn't the shifter, but the position of the "L" (low) trim screw on the derailleur itself. Since the derailleur is stopped by the "L" screw, it is not able to maintain tension on the cable, and the cable goes slack.

3   2    |  1
         |
         ^ actual position of gear "1", the point where the derailleur
           stops at the "L" limit screw and the cable loses tension.

3   2       1
            |
            ^ needle moves here anyway, because of a spring
              inside the shifter, creating the illusion of a perfect
              index position.

If that shifter's internal spring were to break or dislocate, then the shifter would rely purely on cable tension, and will not indicate 1 reliably. The display will move only as far as it is pulled by the derailleur, until that derailleur encounters the "L" screw. At that point, the cable goes slack, and so the indicator is somewhere between the 1 and 2. No shifter spring, no illusion!

Perhaps the Revoshift barrel shifter is also spring-loaded in a similar way: some internal spring that is supposed to rotate the dial to show 1 has stopped working.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.