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How to Determine the Correct Frame Size for a Bike

Watch more Bike Repair & Equipment videos: http://www.howcast.com/guides/80-Bike-Repair-and-Equipment Subscribe to Howcast's YouTube Channel - http://howc.st/uLaHRS Determine the correct frame size for a bike by following these guidelines before you make a purchase. Howcast uploads the highest quality how-to videos daily! Be sure to check out our playlists for guides that interest you: http://howc.st/ytmainplaylists Subscribe to Howcast's other YouTube Channels: Howcast Health Channel - http://howc.st/HOE3aY Howcast Video Games Channel - http://howc.st/tYKKrk Howcast Tech Channel - http://howc.st/rx9FwR Howcast Food Channel - http://howc.st/umBoJX Howcast Arts & Recreation Channel - http://howc.st/vmB86i Howcast Sports & Fitness Channel - http://howc.st/vKjUjm Howcast Personal Care & Style Channel - http://howc.st/vbbNt3 Howcast empowers people with engaging, useful how-to information wherever, whenever they need to know how. Emphasizing high-quality instructional videos, Howcast brings you experts who provide accurate information in easy-to-follow tutorials on everything from makeup, hairstyling, nail art design, and soccer to parkour, skateboarding, dancing, kissing, and much, much more. Step 1: Measure your inseam Measure your inseam by standing barefoot with your back against a wall, looking straight ahead. Hold an inch-thick book between your legs. Measure the distance in centimeters from the top edge of the book to the floor. Tip Perform the measurement three or four times and calculate the average. Step 2: Find your C-C size Determine your measurement for a center-to-center measured road bike frame, which measures from the center of the bottom bracket to the center of the top tube, by multiplying your inseam by .65. Step 3: Find your C-T size Figure your measurement for a center-to-top measured road bike frame, which measures from the center of the bottom bracket to the top of the top tube or seat lug, by multiplying your inseam by .67. This accounts for the additional length of the top of the seat tube. Step 4: Find your mountain bike size Adjust your measurement by subtracting 10 to 12 centimeters from your center-to-top road bike size and converting it to inches to determine your center-to-top mountain bike size. Tip Convert centimeters to inches by multiplying by .3937. Step 5: Consider your body type Since women generally have longer legs and shorter torsos than men, women should look for frames with shorter top tubes or frames that are specially made for women. Men with shorter upper bodies or who prefer a more upright position should also consider frames with shorter top tubes. Step 6: Consider your limb proportions Divide your height by your inseam if you have unusually long or short limbs. If the quotient is more than 2.2, you will need a longer reach or top tube. If it is less than 2.2, you will need a shorter reach or top tube. Step 7: Take test rides Test ride several different frame sizes, taking into account any top tube length added by the saddle post, to get a clearer idea of the size most comfortable for you. Did You Know? Of the 60 riders participating in the first Tour de France in 1903, only 21 finished the race.
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