I have an older touring tandem bike that we use to go on long trips. The gear setup is 3x7. I noticed that we hardly ever use the smallest 3 cogs on the freewheel (of course together with the largest chainwheel). We also struggle on the climbs, so I would like to change the freewheel to help us on the climbs.
The freewheel setup is 13-30. I am thinking or replacing it with something like 16-36 or similar. The problem is that I haven't found a 7-gear freewheel with such a setup. The only freewheel with a better setup that I've found is the Sunrace MFM300 7DV. But the difference seems to be major only on the largest cog (30 vs 34).
This is the current freewheel:
Do you know where I could buy a freewheel with a better setup for climbing than this?
Or would you recommend that I do one of the following?
- Change the chainrings - from what I see, I would have to change all 3 of them, as the screws on the smallest chainring would not allow changing it with a smaller one. Seems to involved for my bike repairing skills.
- Change the back wheel entirely to support a newer, cassette style type of cogs. One problem is that the back wheel is also fitted with a drum brake on the left side, no idea how to properly re-fit it on a new wheel. Also, I would like to keep as many original parts as posible on the bike.
- Changing the wheel's hub to a freehub to support a casette. This has the advantage that the bike will stay with most of its original parts, but would be really involved. Again, might be difficult to impossible to re-fit the drum brake.
Advices welcome, I'm not an expert bike tehnician.
Chainring sizes: 54-48-40.