Depending on how much cycling you do, most Sturmey Archer AW hubs were always equipped with the wrong sprocket. Most I've seen came with 18T sprockets. A larger one can be obtained online, usually 21T or 22T will do it. You'll need to add a link or three to the chain though, but a whole new chain is always a worthy purchase. The majority of sprockets have a snap ring and just pop off, but much older ones are threaded.
Last edited by bazil4696; 03-27-22 at 08:03 PM.