Brompton owners

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Mikey5000

What’s required to convert a 2 speed Brompton to a 3 speed (adding a 17T) sprocket and a new shifter rather than going hub gear? Having tried @Arvy.’s 4 speed I’m contemplating an upgrade.

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mcmyk in reply to @Mikey5000

Buy the kit for both of the above from Minimods via bike gang

https://www.bikegang.co.uk/bikeganghut/Brompton-Stock-Integrated-2-speed-thumb-shifter-to-3-speed-indexed-mod-kit-MiniMODs-p431344504

https://www.bikegang.co.uk/single-post/2-speed-to-3-speed-external-cogs-upgrade-in-detail-minimods-x3-unibody-cog-set-or-x2-1

Plus you'll need a 9sp chain

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Arvy. in reply to @mcmyk

Excellent post, thanks, does @Mikey5000 have the range he needs. Does this give as wide a range as the 4 speeds they now offer on their newer bikes.

I shouldn't admit it, but the freewheel noise is hilarious

*answered on the link

*Ideal combo with our X3 Unibody cog set to achieve 11/14/17T setup (close to P Line 4 speed gear range) *
*
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Mikey5000 in reply to @mcmyk

Thanks! I'll have a look.

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