The Brompton model with the lightest specifications is the P Line Urban - Low; it has Low-Type handlebars and stem, 4 gears, mudguards, and lightweight components.
P Line Urban – Low weigh approximately 9.89 Kg.
Information regarding the P Line model can be found here.
Further information regarding the Brompton range and options can be found here.
All Brompton available models can be purchased here.