How could this be used?

Don't buy it if you want reliability or longivity. That drive is known to crap out at about 250 miles or so. #25 single row chain and thin castings just won't hold up to MB duty use.

Has a 3 to 1 ratio so it would take a very large roller to get fricton drive ratios right.
 
friction drive using a gear reduction case with a sprocket output... you must not like your tires very much. friction drives are direct drive off the motors crankshaft no need for a gearbox
 
yeah and boygoslow is going to sell a 2 speed trans for under $60
even if it was made in china it would not be that cheap.....
 
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