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  • I've just acquired a 2 speed and the gearing is a bit too high for my tastes (as I pootle rather than race @villa-ru ). It's got a 54t chainring, so the simplest way to resolve would be to fit a 50t one. How easy a job is that, given the reputation Bromptons have for complexity. Is it just a case of swapping over the chainring and shortening the chain a bit?

  • Just cut four of the teeth off, obvs.

  • Is it just a case of swapping over the chainring and shortening the chain a bit?

    Bingo.

    You have 102 link in your current chain, just removed the two and you'll have 100 link for the 50t chainring, it need to be exact so it'll fold well without causing the chain to come off.

    Edit: found this chart;

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