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  • I suppose 34x17 and 30x21 could be an option. I rode 34x22 on the south downs and didn't feel like I was spinning out constantly off-road.

  • 30 x 21 is pretty low.
    I'm on 42 x 20 higher gear and 39 x 23 lower gear. I don't think I'd want to be much lower than that, but everyone is different.