Most bicycle frames measure 18 to 22 inches tall. "Generally," a 17 inch frame is most comfortable for riders between 4'9"' and 5'6". An 18 inch frame is best suited for riders from 5'5" to 5'9". Over 6 feet a rider might have a frame size of 22 to 25 inches. However these numbers are not absolute as everyone has a different build and or length of their legs (in-seam). Each of us have our own special and unique body proportions that may alter what works or "feels" best to you. When determining frame size, do not be confused by wheel sizes (24, 26 and 27 inch etc.). Wheel size or diameters are independent of the frame size. As a result, you can find a shorter framed bicycle with larger wheels. Often, smaller sized bikes with 24 inch wheels do have shorter frame sizes, to accommodate younger (children or pre-teen) and or very shorter (under 5') riders. In addition, small diameter wheels will make the bike slightly closer to the ground.
Nowadays very few bicycle manufactures build frames in more than one size. In the past, American companies such as Schwinn and Ross, built each model of their bicycles in two or more frame sizes. Today, that does not seem to be the case. As an example, nearly all new beach cruiser frames are the same height, about 18 inches. Finding an exact frame size can be nearly impossible. The fix is very simple—adjust the seat post up or down to make the bicycle size correct for you. Getting on a bicycle and taking a quick test ride can also be of great help. It is without a doubt the best and quickest way of finding and purchasing a bike with a frame size that fits you properly and avoid all the confusion of measuring each and every bicycle you like. Fortunately, bicycles of today have several adjustments available. Simply moving the seat height up or down can correct many riding positions. Further adjustments of the handle bars can also be of great improvements in riding comfort.
Proper Bicycle Seat Height / Adjustment
Perhaps the biggest problem with the bicycle riders of today is the improper seat height or adjustment. Most riders set their seat far too low. When your bicycle seat is too low, you do not get the full extension of your leg and therefore miss the benefit of the leg-power in your down-stroke movement. In addition a low seat setting can place excessive pressure on your knees making the rider tire-out quicker. Set the seat too high (a rare problem) and while pedaling your hips will rock from side-to-side. When the seat is at the correct height, the rider gains power from less spent effort.
A common mistake for riders is to think they should be able to sit on their bike seat and still plant their feet firmly on the ground—not true! Riders should come off their seat and straddle the bar or frame when stopping the bicycle. If you can sit on the seat and touch your feet to the ground other than using your tippy-toes, your seat is set too low!
To check your seat height, sit on your bicycle with your feet on the pedals, or ride it and take notice. Performing this test while stopped you will need to have a friend hold your bike up-right. When your pedal is at the bottom of its stroke or at the 6 o'clock position, your leg should be extended until it is almost completely straight—there should be only a very slight bend of the knee. See diagram below. If your knee is bent too much, you'll need to raise your seat height. Following your corrected seat adjustment, the new "feel" for the rider will at first be very different. But give it some time and maybe a few miles and you will soon notice a great improvement in riding comfort, leg power and less fatigue. This adjustment will maximize your power and minimize your riding fatigue.
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