Each element of a bike’s geometry must first be designed to align with the biomechanics of its rider. In basic terms, that means that the bike needs to work correctly and comfortably based on the rider’s overall height, as well as the relative lengths and motions of different parts of their body.
For this reason, many e-bikes are offered in multiple frame sizes, each with small adjustments to its geometry, to offer a more precise fit. In general, bikes that are more performance oriented – where a highly tailored and customized fit makes the most difference – will offer a wider number of frame sizes. For the same reason, single-size e-bikes (of which there are many) are often designed for riders of average height but may have difficulty accommodating either very tall or very short riders.
While the subject of geometry is truly a rabbit hole (this is why mechanical engineers exist) we will explain the basics of e-bike geometry and rider positioning in this guide.
Photo credit: Courtesy of Trek
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