I'm a 5'1" adult with occasional hip flexor and knee issues so I bought this crankset to limit range of motion to something more comfortable. The gain ratios (see Sheldon Brown) have not changed significantly on my particular cassette. I can no longer feel my hips and my knee hardly bothers me when riding. I think it has more to do with better glute activation with shorter cranks. it really reduces the range of movement. Some paint chipped around the screw hole during assembly (probably due to carelessness), but durability has been great since then.
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