CHAINRING & GUARD
Since 2013 Brompton bikes have been fitted as standard with the much improved "Spider" crankset. These chainrings are replacements for that crank. All sizes come complete with the chainguard.
A standard Brompton comes with a 50T chainring as standard so if you want to make the bike faster and harder you can change it out to a 54T and if you have lots of hills and want to make it easier get yourself the 44T