I went for 2-speed due the weight-saving, though it's not a major difference. I wouldn't go for 3-speed normal gearing as its too high for stuff a brompton needs to do.
3-speed -12% looks the best to me https://brompton.zendesk.com/entries/22354981-What-are-the-Brompton-gear-ranges-and-ratios-
@laner started
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I went for 2-speed due the weight-saving, though it's not a major difference.
I wouldn't go for 3-speed normal gearing as its too high for stuff a brompton needs to do.
3-speed -12% looks the best to me
https://brompton.zendesk.com/entries/22354981-What-are-the-Brompton-gear-ranges-and-ratios-