If you go from 19 to 15, your wheel moves back half an inch. Make sure that's still going to be in the track ends before you buy a sprocket :-)
Sheldon agrees...1/8" x 4 = 1/2". Theoretically I've enough for 6 tooth difference.
Tried the 19 tonight, no slower, no faster. Which is a good start.
@bluebikerider started
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If you go from 19 to 15, your wheel moves back half an inch. Make sure that's still going to be in the track ends before you buy a sprocket :-)