I have always slapped on whatever I felt like using. With the SRF3 hub I used 50 x 14, then 54 x 15. Now I use 13/15 on both the 2 speed and the 6 speed, both with a 52T chainring. I'm not a fan of big gaps, or of gears that rarely get used. I might feel differently if I lived in the mountains.
I'll pass it on to a friend of mine who has just got the 4-speed.
He's the same guy that had his Brompton fail and this is what they offered as a replacement (it's an upgrade I think).
But he's not using it yet because what he says he should have done was get the SuperLight 6-speed. So I think he's planning to sell his and try and pick up an SL 6 in Amsterdam I believe.
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