This gives an indication of how tall a frame is. Stack is measured vertically from the bottom bracket to the top of the head tube. Knowing the bike's stack (how tall a frame is) and reach (how long a frame is) will allow you to compare between different manufacturers and immediately know if it will fit you, regardless of how it is described or what the seat tube measurement is. The two most fundamental elements of frame geometry are stack and reach. Therefore the quoted size of a bike isn't so useful when comparing across brands. The same measurement could also be described as an x-small or small/medium depending on the manufacturer, style of bike or even region the bike is being sold. For example, a manufacturer may measure the seat tube length of a bike as 51cm, and then describe it is a small frame. Bike stem rise calculator how to#Therefore knowing how to read a geometry chart is crucial to comparing different types of bicycles from different manufacturers.īike frames are commonly measured in centimetres or inches representing the length of the seat tube. When manufacturers refer to the size of a bike whether it be via description like small, medium or large or via a measurement like 51cm, 54cm or 56cm, those measures are not universal or governed by any standards. It's important to know straight off the top that bikes are not the same in terms of geometry and size. The chart below highlights the key areas of a bicycle that are used to take the measurements and commonly form a bicycle’s geometry chart. To kick things off, let’s cover the basics.
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