This is exactly what I needed. My previous set of cranks was 30-39-50. That's two teeth fewer on the small sprocket and it was enough for the ultra low gear to help a lot in my area with my tadpole trike and a Nuvinci 330 rear hub for mountain climbing. I have a 20 tooth sprocket on the hub, and I installed the rear derailleur as a chain tensioner to take up play in the crank gears. My overall gear range is 567% or 14.4 to 81.6 inches. I would love to be able to afford a Roholoff concentrator but that would cost me 6x that.
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