If you're referring to the Brompton when you say "i think it' a 6 speed", maybe they have an extended gear-range option that has more gears in the hub or on the derailleur, but that's all I saw on their chart. I know that someone (I think Sturmey-Archer) makes an internally geared hub with 9 gears, so that would (if Brompton offers it) provide 27 speeds, some of which may be redundant of course. If you're not talking about the Brompton, which bike is the "it" in your posting?

The "Path Less Pedaled" couple say they rode 6-speed Bromptons with the reduced gearing option: http://pathlesspedaled.com/gear/.