I'm considering buying a Brompton and need to make the difficult compromise between weight and gears. I used to commute in London and found the hills, such as the Archway Road in North London, very doable with the 5 speed Sturmey Archer hub. However, I'm now keen on keeping the weight of the bike as low as possible (due to a back injury, i can't carry a heavy Brompton) and so am considering going as low as 2 gears. Is this enough for North London hills, or will i struggle/find it too limiting. What about crazier hills like Ditchling Beacon. Has anyone done that with a 2 speed Sturmey Archer hub or something similar? I probably will only cycle that once a year, so hardly worth basing my buying decision on it, I'm just curious.