Originally Posted by
waytoomanybikes
I am not at home and so can't check, but I am fairly sure that I can Make a 12 t block using the Regina CX6 kit.
I have 3 of those kits in the garage. I seem to remember that I can do an 11 with it though.
12t yes, 11t no. Regina stopped making freewheels ages ago (a decade or so?), so the most used cogs are getting rarer anyway.
The only other 11t freewheels are from Shimano and are the opposite of straight blocks.