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Isn't the idea to run one with a double chainset and so that the number of teeth in each "plane" add up?
I always thought it was for a single front ring? If you have two then you might as well get a derailleur.
Do you think it is rubbing because you are using a 1/8th chain. It is designed for use with a 3/32 isn't it? The thinner chain would probably avoid any rubbing. Does it work out that the chainline is correct with the inner/larger sprocket, and a few mm off on the outer or is a standard spocket offset in line with the middle of the dingle... in which case each sprocket is a couple of mm out of alignment in each direction?
Is it better running on the larger or smaller sprocket?
The chainline is better on the inner ring, I think with thinner chain on the inner ring it would be totally fine. I'm getting into territory I know nothing about here, but I think chains designed for geared bikes have flex in them, so the chainline doesn't matter as much as with a track chain. Maybe worth looking into.
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I'm riding with one at the moment. It's not perfect, a few sounds from the chain rubbing on the inner ring. Plus they're 1/16 sprockets and I'm using a 1/8 chain so not as solid as it could be. But that said, it feels fine, my chain has never come off and there is no noticeable wear on my chain ring so it's probably fine. Those issue are most likely more in my head than actual problems.
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I have a black and white one I can bring into work on Old St tomorrow. Pretty new condition besides one scratch I think.