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Sturmey-Archer vintage motorcycle gearbox information

Sturmey-Archer vintage motorcycle gearbox information. Data includes gearbox numbers cross-referenced to approximate years. I say “approximate” as half a year is as close as I can get with the information available.

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Sturmey Archer types of gearbox.

The cases should have a number stamp, together with two letters as shown below.

CS Gearbox 3 speed medium weight
LS Gearbox 3 speed prefixes LW or HW (Types III and IV ¾ speeds improved LS type no data)
TS Gearbox 2 speed lightweight
BS Gearbox 3 speed light weight
FW gearbox 3 speed improved
BW gearbox 3 speed medium weight
MA Gearbox modified LS type special to Raleigh

Approximate dating Surmey Archer vintage and veteran motorcycle gearbox numbers by year.

CS Gearbox 3 speed medium weight

Year Gearbox type stamped numbers
1913 to 1917 CS Not enough data
1918 CS 20000
1919 CS 30000
1920 CS 40000
1921 CS 50000
1922 CS 70000
1923 CS 80000
1924 CS 84000
1925 CS 87000
1926 CS 90000
1927 CS 94000
1928 CS 96000
1929 CS 105000
1930 CS around 106000

 

LS Gearbox 3 speed prefixes LW or HW

Year Gearbox type stamped numbers
1922 LS 4000
1923 LS 16000
1924 LS 40000
1925 LS 60000
1926 LS 90000
1927 LS 110000
1928 LS 150000
1929 LS 160000
1930 LS 170000

 

TS Gearbox 2 speed lightweight

Year Gearbox type stamped numbers
1920 TS 1000
1921 TS 12000
1922 TS 16000
1923 TS 20000

 

BS Gearbox 3 speed light weight

Year Gearbox type stamped numbers
1924 BS 8000
1925 BS 23000
1926 BS 28000
1927 BS 38000
1928 BS 44000
1929 BS 50000
1930 BS 60000

 

MA Gearbox modified LS type special to Raleigh

Year Gearbox type stamped numbers
1927 MA 1000
1928 MA 4000
1929 MA 8000
1930 MA 12000
1931 MA 14000
1932 MA ?

 

View current Sturmey-Archer gearboxes and parts available