Whole bicycleGot this nice old bicycle as a gift from friends, and it has 7 sprockets in the cassette, plus a hub-gear mechanism with three gears (only two of these work though.)


Another view of the cassette

To come to work I must ride about 7 km, last 2km are uphill, and the last 800m are the steepest. Even with the shifts setup at highest torque, I can manage the entire hill, but only pushing myself to my limits. I would like to have it a little easier.

Would it be a good idea to replace the largest cog in the cassette in this old bicycle with a larger one, so that the toughest uphill parts can become proportionally easier?

Some additional photos: Bicycle photo album

  • 1
    Hi, welcome to bicycles! Without more details, I'm not sure you can get a definite answer. Could you edit in more details, like the sizes of your existing sprockets, the brand/make, capacity of your derailleur... Photos might help too.
    – DavidW
    Commented Mar 2, 2020 at 16:05
  • Ok thanks, will do as soon as I get home and gather all the details accurately. Don´t have the bike with me right now.
    – Raulinbonn
    Commented Mar 2, 2020 at 16:09
  • 1
    This configuration is most likely to run a screw-on freewheel where it might be difficult to replace a single sprocket. The simplest way would probably be to replace the front chain-ring with a smaller one. Servicing the hub might be a good idea, too.
    – Carel
    Commented Mar 2, 2020 at 18:53
  • Links to photos added
    – Raulinbonn
    Commented Mar 2, 2020 at 19:46
  • Hi Raulinbonn. If you edit the photos directly into the question, it might get more interest, clicking links is soo 2019
    – Swifty
    Commented Mar 2, 2020 at 20:39

1 Answer 1


I was surprised to find that not only did they make this configuration, but it is still made and is available as a 3 speed IGH (integrated gear hub) and a 9 speed free-hub. I have seen older Altus derailleurs similar to the original in the photo used with 28 tooth 7 speed cassettes. I would feel confident in stating that such a set up would work here. A quick search shows a wide range of 7 speed units are readily available. Looking at the photo of the front crank I don't think a smaller tooth front sprocket would be available. The prospect of installing a 3 speed front crank would be a interesting engineering exercise.

  • Thanks! So from what I understand, a full cassette replacement would be needed then, just replacing that biggest cog would be a no go?
    – Raulinbonn
    Commented Mar 3, 2020 at 8:30

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