Sturmey Archer cog configuration
 

Hi !
I have a 3 speed SA hub and I wonder if its possible to use two cogs on a SA 3 speed hub ?
Thanks

I have. It works if you remove the spacers and run one sprocket offset to the inside and one offset to the outside. Bigger sprocket on the inside. Roger

At the same time? or are you asking if they can be changed? If you are wanting to run multiple sprockets at the same time, the only way I know to do it is with a Cyclo Conversion Sprocket (look about half way down the page) If you are looking to swap sprockets out it is very easy, the hardest part being if you need to shorten or lengthen the chain.

Aaron:)

Isn't that how the 6-speed Brompton is achieved?

In the old days you had two 1/16" spacers and a 1/8" cog. 22/19 is a mathematically perfect 1/2 step on an AW and nice sizes for 26" wheels. Cogs under 16t weren't dished, so small wheel options were limited

But the newer hbs have only about 0.150" between the dust cover and the snap ring. Brompton must use special, thinner cogs to make it work.

I used to use a modified Shimano freehub cog on the inside and the dished SA sprocket on the outside.

You could theoretically fit three if the inside and outside were dished and the middle one flat. Frank Berto once wrote an article describing how he did that. As I recall he somehow dished the inner (largest) sprocket himself.