![]() ![]() On a X / Y plane, the horizontal X coordinate is often achieved at the expense of the Y coordinate: sizing bigger or smaller not only changes effective top tube length (a factor of X) but it also changes headtube height (a factor of Y). However, sizing down can have some significant compromises for some riders. For example, I’ve seen some riders who swear by sizing down a frame and running really long stems, 130mm and greater, always assuming that sizing down is the right approach. A “fit first” approach to frame sizing yields greater accuracy in position and also will help clarify what frame size makes the most sense by showing how the rider’s position relates to the frame geometry before you buy. This all being said, there is no reason to guess on this. Without a proven process to determine riding position first, left to choose on non-fit related variables, smaller often “sounds” better to many performance oriented riders. Without a rider first fit philosophy, the bike’s needs will often be dictating your power and comfort instead of your needs determining how the bike can help you achieve your potential. Second, and probably most significant, not all bicycle dealers promote a fit first philosophy and the sizing of a bike becomes more abstract and less data-driven when there is not a proven protocol that corresponds to the selection process. In a nutshell, all else being equal, a smaller frame with “tighter triangles” and shorter tubes are actually stiffer than a bigger frame and thus can transfer power more directly. ![]() First, compact frame geometries and sloping top tubes have laterally stiffened frames over their non-sloping, traditional predecessors. ![]() I think your question is common for two primary reasons. Your question is very common because it is one that many riders have felt they must face. Q) This could be very abstract sounding, but is it preferable for a rider between sizes to select the smaller size with a longer stem, or a larger size frame with a shorter stem? Is power lost in the smaller frame that is otherwise better distributed or better applied in the larger frame? – Christopher ![]()
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