Sturmey archer confusion.

[Gillstay]

I have a Sturmey archer rear wheel I wish to use and a 1/2 x 3/32 chain and sprocket bought new to match the chain wheel.
I have fouled up as gone to fit them and the old sprocket and hub have a much smaller internal dia.
I have had little to do with Sturmey archer.
What my easiest and cheapest way out of this ? I am just trying to make a bike that can be left at the station and less likely to be nicked.

 

[Punkawallah]

Short term? Find a local bike Co-op and buy another rear wheel to fit - use the bike as a single speed until you get sorted out.

 

[Chris S]

What sort of Sturmey Archer hub do you have? (AW, SRF, etc)

Sorry, I've just noticed that you've got a cassette under the table. The sprocket you have looks like it's for an AW hub.

What are you trying to do with the cassette?

 

[Punkawallah]

Come to think of it, what part of the country are you at? I probably have a wheel somewhere.

 

[grldtnr]

There are ways and means , but ultimately it does depend on what you have ,and what you trying to achieve.
For instance ,whilst not recommended, you can put 2 SA cogs back to back on an AW hub, say 17, & 19, then run a deralliurr to in effect have a 6 speed IGR, tried it but don't recommend it,
If you want a combo hub ,a dual drive , Sturmey produce the SRF / DERALLIURR HUB, which works very well on my recumbent,it's heavy, but changing ratios at a standstill is of great benefit.
You will not easily produce a dual drive Sturmey Archer, out of bits and pieces box,if you have a 3 SPD ,that's the best option .
Possibly you could have a double on the front , but you will need a tensioner on the chain , you couldn't really have a drastic lower ratio , as the gear internals won't like it.
Sturmeys are great for what they are, but building systems out of bits and pieces isn't really feasible, unless you have loads of SA spares and knows what your doing.
If your looking for multiple IGR hubs then the Shimano 8 speeds are a good start, but not SA compatible

 

[tyred]

I have a funny feeling you have the sprocket for an eight speed SA hub as the the internal diameter looks bigger than it should be in relation to the external diameter of a 20 tooth sprocket. A 20 t AW sprocket would normally have holes around the outside of it.

 

[grldtnr]

Yes , 3 slots .

 

[Gillstay]

What sort of Sturmey Archer hub do you have? (AW, SRF, etc)

Sorry, I've just noticed that you've got a cassette under the table. The sprocket you have looks like it's for an AW hub.

What are you trying to do with the cassette?

Not sure what you mean by AW SRF etc

 

[Gillstay]

Come to think of it, what part of the country are you at? I probably have a wheel somewhere.

Worcester. Will post a photo of the wheel/ hub on Saturday ass this seems more complex than i thought.

 

[Gillstay]

There are ways and means , but ultimately it does depend on what you have ,and what you trying to achieve.
For instance ,whilst not recommended, you can put 2 SA cogs back to back on an AW hub, say 17, & 19, then run a deralliurr to in effect have a 6 speed IGR, tried it but don't recommend it,
If you want a combo hub ,a dual drive , Sturmey produce the SRF / DERALLIURR HUB, which works very well on my recumbent,it's heavy, but changing ratios at a standstill is of great benefit.
You will not easily produce a dual drive Sturmey Archer, out of bits and pieces box,if you have a 3 SPD ,that's the best option .
Possibly you could have a double on the front , but you will need a tensioner on the chain , you couldn't really have a drastic lower ratio , as the gear internals won't like it.
Sturmeys are great for what they are, but building systems out of bits and pieces isn't really feasible, unless you have loads of SA spares and knows what your doing.
If your looking for multiple IGR hubs then the Shimano 8 speeds are a good start, but not SA compatible

I am just after a chainwheel and 3 speed hub set up. So I have it all, but the new rear sprocket is correct to the chain and chainwheel, but not the 3 speed hub which has a smaller internal dia. Sorry I seem to have caused confusion. Do I need a different size chain and chainwheel, or can I just get a sprocket with a smaller internal dia that will fit both ?

 

[tyred]

You need one of these - https://www.ebay.co.uk/itm/37117833...PO-mQ6kTYu&var=&widget_ver=artemis&media=COPY - to fit a three speed hub (assuming it was made after about 1951).

 

[tyred]

I've just remembered that you wanted to use a 3/32" chainwheel.

If you already have the chain, a Shimano 7 or 8 speed Nexus hub sprocket will fit if SA don't make one. If you don't already have the chain, a 1/8" chain will work fine on your 3/32" chainset.

 

[Punkawallah]

Worcester. Will post a photo of the wheel/ hub on Saturday ass this seems more complex than i thought.

I’m on the Durham/Yorkshire border. If you want to pay the postage, and give me the wheel size, I’ll have a root around to see if I have one.

 

[Chris S]

Not sure what you mean by AW SRF etc

It's the model of hub. Most Sturmey Archer 3-speeds from 1938 onwards were AWs or one of their variants. They all used the same size sprockets, they were even interchangeable with some other manufacturers' 3-speed hubs. I think we will have to wait for a picture of the hub, it may not be a Sturmey Archer.

 

[figbat]

It's the model of hub. Most Sturmey Archer 3-speeds from 1938 onwards were AWs or one of their variants. They all used the same size sprockets, they were even interchangeable with some other manufacturers' 3-speed hubs. I think we will have to wait for a picture of the hub, it may not be a Sturmey Archer.

If it’s a Sturmey Archer then the model code will be stamped on the hub somewhere, as well as the month and year of manufacture.