Brompton G Line Bottom Brackets

What is a bottom bracket?

It sits in the bottom of the bike frame and contains ball bearings - the crankset attaches to the bottom bracket - and it means that when you pedal the pedals drive the chain to push the rear wheel around

Is it the same as a standard 16 inch wheel Brompton?

The Brompton G Line uses a different length spindle on the bottom bracket when compared to the standard / traditional 16 inch wheel size Bompton folding bike

• 16 inch wheel - 119mm length spindle 
• G Line (20 inch wheel) - 123mm length spindle

The extra length means that the chain will clear the wider tyres on the rear of the bike