Sturmey Archer Splined Sprockets

These cogs for Sturmey Archer internally-geared hubs and coaster brake hubs will fit any model which takes trilobe 34.8mm inside diameter sprockets, notably their 2-speed and 3-speed offerings.

Dished sprocket is the one normally used and can be flipped if needed to adjust the chainline.

1/8" chains are traditional and are the same type used for fixed-gear bicycles. 3/32" chains are multi-geared, and any 7, 8, or 9-speed chain can be used for these cogs. Just match your crankset!

Cogs 18-teeth and above have weight-reducing cutouts. All are made of chrome-plated steel, they're very durable.

It's tempting to use a huge cog with a small chainring to get very low gearing, but in practice it's possible for a Sturmey-Archer hub to be overtorqued (particularly certain generations of AWs), and it may damage the internals to do so. You're almost certainly fine, just keep it in mind if you're going for some wild modifications.