Road bike Q-factors typically range from 145-155mm; gravel and mountain bikes are wider. A narrower Q-factor can be more aerodynamic and biomechanically efficient for riders with narrow hips; wider is often better for riders with wide hips or those who need more knee tracking room. Adjustable via pedal stack spacers or different chainsets. Q-factor matching to anatomy is one of the most overlooked elements of bike fit.
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