Brompton owners

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Nick_S in reply to @finger_jockey

And getting the gearing right because even with a half link, the tension must be just right so the tensioner doesn’t flick up and hit the stay.

That looks very neat. What will happen when the chain elongates as it wears, will this cause problems with the tensioner?

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finger_jockey in reply to @Nick_S

Currently when the tensioner engages, it’s still very minimal movement, maybe still an inch away from the stay. I guess if it gets too bad, I could remove a link to take up the slack. I’m currently considering the benefits of adapting a Surly Singleator as it would be tidier and you can adjust the jockey wheel chainline more easily.

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Nick_S in reply to @finger_jockey

I’m currently considering the benefits of adapting a Surly Singleator as it would be tidier and you can adjust the jockey wheel chainline more easily.

Ben Cooper of Kinetics did something similar to enable the back-pedal gear change and braking on a Duomatic hub (SA redux version, I think):
https://www.kinetics-online.co.uk/folding-bikes/brompton/cableless-brompton/

It looks like a modified 3rd party tensioner for the Brompton (he says "The tensioner is reinforced, and it moves up to hit a stop when back-pedalling"), but I cannot work out what the white rod is for on top of the right-hand chain stay.

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