Need a 19 or 20 tooth sprocket for my "bomber"

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I would like to swap out the rear sprocket for either a 19t or 20t. Leaning towards a 20t. Stock gearing is 38/16. The wheel came stock from Trek and the coaster brake hub is branded Promax(never heard of it). The only 20t sprockets I've found are Sturmey-Archer and I'm not sure if they'll work.

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Re: Need a 19 or 20 tooth sprocket for this

The Sturmey should work. I think they started that style.
 
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