Originally Posted by someoneelse
How high should your seat be when riding? At the pedals lowest point how straight (or bent) should the leg be?
Common wisdom is to set (as a starting point) the height of the seat so that your fully outstretched heal just hits the pedal at its (the pedal's) lowest point . Then adjust slightly from there. You want to maximize leg extension while never getting to the point at which your hips rock.