Join Date: Jan 2004
Location: Fremont, CA
Bikes: Ti Sports roadie, Cannondale CAAD 3, Tern Cargo Node, Helix (soon)
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This was my experience as well, except I caused it.
When I first purchased my Brompton, I rode it and never had a problem. As I got used to it, I read that a rear tire change could be tricky the first time if you've never taken the rear wheel off, so I thought I would practice to make sure I got the hang of it.
In my case, my 3 --> 2 speed was caused because I pushed the chain indicator too far into the plastic adjustor when I replaced the wheel. Not only that, but when I put it in the adjustor, it looked too loose to me, so I loosened the adjustor and pushed it up the cable. That's when my problems started, but I didn't know how to fix my mistakes.
When I finally had an LBS guy check it out, he said I only had to push the chain indicator into the adjustor until I heard two clicks - the cable is supposed to be rather slack. But he did other things as well:
- When he first examined the problem, he kept looking at the cable, not the hub.
- He unscrewed the adjustor and took it off, then he re-seated the cable over the pulley housing.
- He inspected the cable and rewove the cable end by hand as it was beginning to unthread.
- He screwed the adjustor closer to the end of the cable, then pushed the chain indicator into it a couple of clicks and tested the gear shifting.
It worked. Now I have all my gears working.
Did you, by any chance, unseat the adjustor while you were adjusting the cable tension? How far did you push in the chain indicator?