Join Date: Jan 2008
Location: Cheshire, North West England, UK
Bikes: Brompton S2L-X, Bridgestone Moulton, 1963 & 1966 Moultons, Scott Mountain bike
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it sounds like you are describing the 6 speed.
Both the 2 and 6 speed bikes use a derailleur operated by the two position lever on the left side of the handle bar. The 6 speed has an extra three position lever on the right hand side of the handlebar that controls the 3-speed internal hub.
The 2 speed bike has two cogs on the rear wheel and the derailleur (lever on left handle bar) is used to change between the 2 gears.
To summarise, if the bike has two gear levers it is a 6-speed. A single gear lever on the left is 2 speed. If it has a single lever on the right it is a 3 speed.