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The Brompton Crankset 50T is a replacement set with left and right hand crank, including chainring and chainguard, as found on post 2013 Brompton Bikes.


A standard 3 or 6 speed Brompton comes with a 50 tooth front chain ring.


A standard 1 or 2 speed Brompton comes with a 54 tooth front chain ring - changing to 50 teeth will decrease the gearing by approx 7%.


The Bottom bracket is NOT included - If upgrading from the old fixed crankset then you will also need to change the bottom bracket (the old one was ISO standard and the new one is JIS standard).


Crankset 50T - Spider type