The custom made sprockets I've tried were all made of aluminum rather than steel, and wore out very quickly. Rather than use custom made sprockets I'd like to see an adapter made so a readily available JTF sprocket could be bolted to the hub.
For my use a 13/40 (428 chain, 3.076/1) works great. Climbs great from a stop and tops out at about 40 mph.
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