Williams B109 - B1109 Group
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Category:  Chainrings
Name:  Williams B109 - B1109 Group
Brand:  Williams
Model:  B109 - B1109
Years:  1937 - 1960's
Country:  England
Added By: bikeville on 01/02/08
Updated By: Paul Mayo on 09/06/16
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Williams B109 - B1109 GroupWilliams B109 - B1109 GroupWilliams B109 - B1109 GroupWilliams B109 - B1109 Group
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Identifying MarksBCD 
Tooth Count Range23Ring PositionSingle Ring
Chain PitchOne InchChain Width1/8"
General Information
One Inch pitch spacing, but by 1/8" width, not the usual 3/16" wide.
Stamped on the front "Edge"
Williams dated coded 1937. normal 5 pin pattern BCD
From Paul Mayo: The "Dureel" aluminium chainwheel Type B109 is illustrated in a 1937 Williams catalogue and again as B1109 in a leaflet probably from the late 1950s or early 1960s.. The B109 group was of the same design in chromed steel from the 1930s and possibly earlier.
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Additional Resources
Resources:Reference & Charts
Brand Information(click to expand)
 Williams produced cranksets from the 1920's through the early 1980's or later.  Most noted, perhaps unfairly, by their lower end cranksets which changed little from the 1920's into the early 60's.  ClassicLightweights has more information on this brand.
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