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sbbohr
C4r1s
mcmyk
Yes but you’d need an aftermarket rear triangle. If you have the stock triangle it’s 120mm wide at the dropouts, most non-Brompton hubs are 130 or 135mm, of which alfine is.
It sounds like you just have a stock 3speed bromton with the sturmey hub. Defintely more cost effective to go 6 speed at the back if so