What size is a 19-inch bike frame? - Quora

Answer (1 of 8): The size is the length of the seat tube, although how it’s measured can vary considerably. You can measure from the centre of the bottom bracket shell to the centre of the top tube, the centre of the bottom bracket to the top of the top tube, from the bottom of the bottom bracket

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Is it recommended to buy a 20-inch bike for an 8-year-old? - Quora

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How to Measure a Bicycle Frame Size

How to Measure a Bicycle Frame Size

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What size of hybrid/road bike should I get as a 5 ft. 3 in. adult male? - Quora

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When they say a bike is 16 inches or such, what are they measuring and how do you know the right size to buy? - Quora

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