November 30, 20169 yr You should be able to get 11/48 gearing on that bike. Since you will only use the sm. gears, just get a cheap cassette and replace it when the 11 T wears out. There is more to tuning up the derailleur than just "aligning the chain" and making it shift. The placement of the last idler wheel in the correct position relative to the cassette is important to making the gears last. I suggest you study the procedure, Sheldon Brown is a good place.
November 30, 20169 yr You should be able to get at least 5000 miles out of your top gear because the gears on bikes with hub-motors don't wear out, not even the top gear, and not even the cheap ones. You should be able to get at least 5000 miles out of it for normal road use. Those freewheels normally have a 14T top gear. I always use DNP freewheels with 11T. Mine's done 4000 miles so far and isn't showing any signs of wear.
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