Here are some basics to make sure you bike is both comfortable and efficient to ride:
* Seat height: With the pedal at the bottom of a stroke and the ball of your foot on the pedal, your knee should bend slightly.Your hips should not move from side to side as you pedal.
* Steering:: Bend your elbows slightly in reaching the handlebars. Be comfortable. Don't put bars so low that you must stretch or so close that you're cramped.
* Fore? Aft?: With your feet at 3 and 9 o'clock, your front knee should be over the axle of that pedal. A seat that's too far forward requires unwise pressure on the inside of your kneecap. Too far back, and your hamstrings will stretch too much. A bolt under the saddle lets you adjust.