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.
11 speed cassette and a thinner lockring plus the shifter conversion kit.
@coventry_eagle started
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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.