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# How do you determine what size bike you need?

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To determine what size bike is the best fit, consider frame size and seat height. According to Bicycling magazine, first measure the rider's inseam length in centimeters, and then multiply that number by 0.65. The resulting number is the correct frame size for a road bike. For a mountain bike, subtract 10 to 12 centimeters from the road bike number, and to get the seat height, multiply the inseam measurement by 0.833.

## Keep Learning

Another way to determine a correct bike fit is to measure the rider against the bike. Wear the shoes typically worn when biking, and then straddle the bike frame. The inseam, or the distance from the bottom of the foot to the crotch, should be at least 1 inch above the frame of the bike. Next, sit on the seat of the bike, and put one foot on a pedal.

Press down on the pedal with a foot until the pedal reaches its lowest position. The pedal should be able to be pressed all the way down with a slight bend to the knee. If the pedal cannot be pressed all the way down, the seat height is too high. If the knee is bent a lot, the seat height is too low. Unlike frame heights, seat heights can be adjusted, so make sure to adjust the seat before deciding if the bike is a good fit.

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## Related Questions

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To calculate a good bike size fit, taking some body measurements followed by some basic formulas using the measured inseam, torso and arm length is the starting place. The basic measurements of leg inseam, which measures the distance from crotch to foot, torso length, which measures from the crotch to the sternum, and arm length, which measures from the end of the collarbone to the middle of a closed fist, are necessary.

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To use a bike sizing chart, measure your height and inseam, then choose the bike size on the chart that is closest to those measurements. Bike size charts vary depending on the type of bike, and some charts only require an inseam measurement.

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Determining the proper size bike for a child is based on the size of the bike's wheels as opposed to determining size for adults, which is typically measured using the frame. Unless a child is unusually tall or short for his or her age, there are standards for every age beginning from the age of 2. Once the basic size is determined, then other amenities can be selected, such as number of speeds, types and shape of the handle bars, types of seats and how the brakes work.