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  • 2 speed has a simple derailleur, 3 speed is an internal hub gear so as a bare minimum you need a new rear wheel and shifting mechanism.

  • 2 speed has a simple derailleur, 3 speed is an internal hub gear so as a bare minimum you need a new rear wheel and shifting mechanism.

    TBF, you can use the derailleur in the 3 speeds, as the chain is 3/32 regardless (unless it's the older Brompton with the 1/8 chain).

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