AC racing 15 tooth freewheel for standard hub thread; the limiting size is usually the pawls so they shifted them outboard to get the smaller cog on.
http://www.sheldonbrown.com/harris/singlespeed.html
@dubtap started
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AC racing 15 tooth freewheel for standard hub thread; the limiting size is usually the pawls so they shifted them outboard to get the smaller cog on.
http://www.sheldonbrown.com/harris/singlespeed.html