So you're looking to convert a fleet of these to freewheel?

1. Measure rear spacing and check ERTRO (written on tire sidewal, maybe 48 x 559, 42 x 590, something like that)



2. Then call Niagara Cycle to see what they have for you. They have rear wheels w/ freewheel hubs starting @ $16, but you'll probably want to spend about $22 apiece for alloy rimmed wheels.

3. Get freewheels and rim strips from them also.

4. Ask for bulk discounts for a 25 ea. order.

5. Respace / redish rear wheels as needed. Screw on freewheels swap tires/tubes over from original wheels. Sell all original rear wheels on CL.

Personally I think I'd just keep rolling with coaster brake. They work just like freewheels 'til you backpedal.