Sturmey Archer FM Medium ratio 4-speed
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Category:  Geared Hubs
Name:  Sturmey Archer FM Medium ratio 4-speed
Brand:  Sturmey Archer
Model:  FM
Years:  1939 - ?
Country:  England
Added By: JFischer on 05/19/08
Updated By: JFischer on 03/24/10
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Sturmey Archer FM Medium ratio 4-speedSturmey Archer FM Medium ratio 4-speed
Hub MarkingsGear Count4
Spoke Drilling36; 40Includes BrakeNo
Lockout Nut SpacingShell Material
Gear Ratios+12.5% / direct / -14.3% / -33.3%  
General Information
The gear range for the FM is as follows -- 4th: 112.5  3rd: 100  2nd: 85.7  1st: 66.7.  Designed to be all around "club" gearing.

http://www.sheldonbrown.com/sturmey-archer/fm.html
Quality:Rarity:
 
 
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Additional Resources
Resources:Reference & ChartsCatalogsExternal Resources
Brand Information(click to expand)
 Best known for the internal geared (planetary gearing) hub, Sturmey Archer is another one of the most recognized brands in cycling.  The company has been bought and sold several times since it's origins, and at some time was owned by the same parent company as both Brooks and Raleigh.  The company is still in business (well, the name is still in use anyways), and there are still internal geared hubs produced today with the Sturmey Archer name.
 
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