Stack and reach is essentially any point on the bike, relative to the bottom bracket, measured against true horizontal (x) and vertical (y). The measurements are relevant to the horizontal and the vertical, neither of which are typically present in bike design. It is, for all intents and purposes, ‘outside’ the system. Stack and reach is a system of absolute measurement. This schematic makes the process pretty straightforward - four measurements can give you frame, handelbar or elbow pad stack and reach numbers Thomas McDaniel / Immediate Media Furthermore, it’s unaffected by anything an industrial designer can influence. There is nothing proprietary about frame stack and reach, except the actual measurement, of course. Not to mention the variation of measuring that theoretical top tube.ĭon’t believe me? Pick five random brands and look at their geo drawings and it quickly becomes apparent how ‘proprietary’ measurements have become. What about offset seat tubes? How does a ‘corrected’ top tube measurement take that in to account? Simple, it doesn’t. “Fake news - there’s ‘horizontal’ top tube,” the crowd retorts. Ironically, if you asked a modern frame builder to create a new bike for you, they’d likely first ask for your stack and reach. The reality is this: with modern carbon designs, the top tube has been a misleading measurement since the first signs of sloping tubes.
Bike fit geometry calculator professional#
database of bike measurements that may or may not have fit professional riders (and thus was only applicable to professional cyclists).
It quickly becomes apparent how ‘proprietary’ measurements have becomeĪll this was largely an artifact of Italian designs and several archaic seat height methodologies, some based on the C.O.N.I.
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