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That's the chainring I've got: http://s.aliexpress.com/ieUBryAN
I should note that I've got them fitted to Ultegra 130bcd cranks, not standard Brompton ones, but can't see why it wouldn't work?
TurtleRecall
PhilDAS
Yeah my Nocturne average was about 32kph or something and my heart rate peak/average was highest it’s ever been - wild cadence. Will check out those Chainrings. Also with the 2spd I can singlespeed it very easily if I so wish.