The position of your bike seat plays a critical role in your pedaling efficiency and safety. If you have never adjusted the seat of your bicycle, it might take several adjustments and practice rides to find the correct balance of comfort and alignment.
Expert Insight
Injuries of the groin, back, buttocks and knees are common among both male and female riders, according to a 1995 study published in the International Journal of Sports Medicine that researched overuse injuries among recreational cyclists. Sports therapist and trainer Brian Mackenzie concludes from this study that improper orientation of the bike seat plays a critical role in some of these overuse injuries.
Considerations
The placement of your bike seat is related to the length of your legs and feet. The seat should be high enough that your leg is nearly fully straightened at the bottom of the pedal stroke. This position transfers as much power as possible without hyper-extending your knee. Some leeway in the height of the seat is acceptable to improve your comfort when you ride, but you should try to have it at a height that will give the best biomechanical pedal stroke possible.
Adjustment
To adjust the seat height on your bicycle, insert an Allen wrench into the pinch bolt at the joint where the seat post meets the bicycle frame and loosen the bolt. Seat posts are often held tightly within the frame, so it may be necessary to twist the seat back and forth as you push down or pull up on it. Once you have the seat at the desired height, ensure that it is straight in line with the bike frame and tighten the pinch bolt once more.
Minor Adjustments
Cycling expert Sheldon Brown states that making fine adjustments to your bike seat height becomes increasingly difficult as you close in on the correct position. He adds that it is natural for most people to want their bike seat slightly lower than is proper for them. After finding the generally correct height, raise the seat 1 cm and ride a couple of miles on it. If the ride becomes easier than it was before, raise the seat another centimeter. Continue this fine adjustment process until the seat becomes too high and then back it down slightly. Always wear your regular riding shoes or cleats when adjusting the seat height because the thickness of the soles plays a factor in fine adjustment.
Identification
To determine the generally correct placement of your seat, sit on it and place the ball of your foot on the center of the pedal spindle. Crank the pedal to its lowest position. There should be a slight bend in your knee when the pedal is in this position. The correct height can also be checked by placing your heel on the center of the pedal spindle, in which case your leg should be entirely straight. Your knee should also be laterally centered over the pedal when the crank arm is in the 3 o'clock position.
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