K- series Sturmey


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SirMike1983

Cruisin' on my Bluebird
Jun 27, 2008
3,007
2,591
United States
#4
The Model K is the predecessor to the Model AW, but also was produced alongside the AW for a brief period. Gear ratio should be basically the same as the AW.

There are major differences in the K series of hubs, depending on whether the hub is from before or after 1933. It is noteworthy here that the K underwent several changes to the parts over the course of its life. A 1933-37 K hub (and especially 1936-37) has quite a bit common with the early AW, whereas the pre-1933 K hub is much more different from the AW internally.

These changes were often made to simplify and cheapen production of the hubs. The AW is a bit simpler and was apparently cheaper to produce than the K, though the later K hubs shared more features in common with the AW than the earlier K hubs. The AW (and maybe the very late K, to the extent AW parts may work) is MUCH easier to get replacement parts for today. The K and the AW were also produced at the same time for a brief period in 1936-37.

I encourage you to read Tony Hadland's fact sheet on the K. Hadland is a wealth of knowledge about all things Sturmey (and Raleigh). He has written several good books on these subjects.

https://hadland.files.wordpress.com/2012/07/k-series-s-a-hubs.pdf

In the U.S., I would rate the rarity as:

pre-1933 K model: rare to find in the U.S.
1933-37 K model: uncommon but can be found with some looking/patience.
Early AW: not very common, but turn up several times per year on eBay and similar. More common than K.
Post-war AW: common in the U.S.
 
Likes: Oilit

1951 C.W.S

Look Ma, No Hands!
Feb 25, 2019
88
49
Fort Collins Colorado
#5
The Model K is the predecessor to the Model AW, but also was produced alongside the AW for a brief period. Gear ratio should be basically the same as the AW.

There are major differences in the K series of hubs, depending on whether the hub is from before or after 1933. It is noteworthy here that the K underwent several changes to the parts over the course of its life. A 1933-37 K hub (and especially 1936-37) has quite a bit common with the early AW, whereas the pre-1933 K hub is much more different from the AW internally.

These changes were often made to simplify and cheapen production of the hubs. The AW is a bit simpler and was apparently cheaper to produce than the K, though the later K hubs shared more features in common with the AW than the earlier K hubs. The AW (and maybe the very late K, to the extent AW parts may work) is MUCH easier to get replacement parts for today. The K and the AW were also produced at the same time for a brief period in 1936-37.

I encourage you to read Tony Hadland's fact sheet on the K. Hadland is a wealth of knowledge about all things Sturmey (and Raleigh). He has written several good books on these subjects.

https://hadland.files.wordpress.com/2012/07/k-series-s-a-hubs.pdf

In the U.S., I would rate the rarity as:

pre-1933 K model: rare to find in the U.S.
1933-37 K model: uncommon but can be found with some looking/patience.
Early AW: not very common, but turn up several times per year on eBay and similar. More common than K.
Post-war AW: common in the U.S.
Thank you
I’m going to one of my favorite co-ops today to see that I can find for my project⤵️
Hope I can find it
 

sam

I live for the CABE
May 24, 2006
1,460
454
San Antonio, United States
#6
I have an early K (drum brake) hub. Alldays has esclusive rights to the K when it was introduced. My K hub stamped A ----is it an early Allday?
 
Likes: 1951 C.W.S

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