Purchased to replace the crank on my old Terra Trike Path. My original crankset was a 1 tooth, 46 tooth cog and it didn't give me a gear low enough to climb some of the hills near my house. I experimented a bit with the 53/39 crank and it wasn't low enough either. The 50/39/30 gives me a gear low enough to get uphill. My total notched inch range is now 15.5 to 85 inches. It seems to be working fine for me so far.
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