Why not just get a singlespeed coaster hubs? they sell them for £20 including cog and a wide varies of spacing at bikefix.
the hubs will stay in gear depending on what you set it to.
Locking - coaster hubs tend not to have a thread, just a place to push your cog on and a round metal thing to hold it in place.
and Google is your friends;
http://vancruisers.ca/Members/bhughes/tech-stuff/3-speed-coaster-brake-shootout
@edscoble started
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Why not just get a singlespeed coaster hubs? they sell them for £20 including cog and a wide varies of spacing at bikefix.
the hubs will stay in gear depending on what you set it to.
Locking - coaster hubs tend not to have a thread, just a place to push your cog on and a round metal thing to hold it in place.
and Google is your friends;
http://vancruisers.ca/Members/bhughes/tech-stuff/3-speed-coaster-brake-shootout