Brompton sell 54t chainring.
Perfect, thanks!
BTW, forget to mention, you'll need a new chain too, check the wear on your chain as you may need to replace the sprocket too.
With 54t, you'll need a 100 link chain for the 3 speed, for the 2 speed, 102 link.
@Cazakstan started
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Brompton sell 54t chainring.