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Old 03-18-16, 09:12 AM
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Shimagnolo
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Interesting device.
I might try it some time.

BTW on the chain wrap issue: The chain does *not* need to be tight on the small/small combo. In fact, I've seen issues where a chain would try to crawl off the side of the lower pulley in the big/big combo because the pulley was pulled so far forward that it was no longer in the plane of the chain. Think about it; when the lower arm of the RD swings forward in a cross-chaining situation, it is staying in the plane of the currently-engaged cog, which moves it away from the plane of the chain as it swings forward.

The solution is to just make the chain long enough that there is slack in the small/small combo. There is absolutely no problem with this; All the gears will work just fine. I have 2 bikes set up they way.

Last edited by Shimagnolo; 03-18-16 at 09:17 AM.
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