Some people say its easier to spin with shorter cranks as you're making smaller circles with your legs, but apart from that its down the toe overlap with smaller or tighter frames, and for leaning into corners, it helps to have shorter cranks.
@AngelD started
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Some people say its easier to spin with shorter cranks as you're making smaller circles with your legs, but apart from that its down the toe overlap with smaller or tighter frames, and for leaning into corners, it helps to have shorter cranks.