Then sloping top tubes came in and complicated matters further by shortening seat tubes, and there's the massive variation in top tube and head tube lengths between different models to consider. A 56cm bike from one brand might fit you perfectly while a 56cm bike from another might feel way too small.Ī frame size used to refer to the length of the seat tube (and it still does in some cases) but it gives you no more information on the ride position you're likely to get. You know how shoes and jeans vary in size between manufacturers? It's the same with bikes. Bike geometry calculator how to#These figures allow you to assess quickly whether a bike is likely to offer the ride position you're after before you dig deeper (we're not covering how to determine the best stack and reach figures for you here we'd suggest you get a professional bike fit for that). Stack and reach don't tell you everything you need to know about a bike's geometry but they're a useful start. So stack and reach, expressed in either millimetres or centimetres, are measurements between the same two points, one being the vertical component and the other being the horizontal component. Reach The horizontal distance from the centre of the bottom bracket to the central point at the top of the head tube. Stack The vertical distance from the centre of the bottom bracket to the central point at the top of the head tube. Of course, the comparison must be on frames of the same size, because the larger the frame, the greater the stack and reach values.Stack and reach are terms that get bandied around all the time in the bike world, but what exactly do they mean and why are they useful to know?īack in ye olde dayes comparing bike geometries was a matter of looking at tube lengths and angles and doing a bit of arithmetic, but then stack and reach came along – initially pushed by Canadian bike brand Cervélo and soon taken up by everyone else – and made things a whole lot easier. This makes it easier for frame designers or bike fitters to set up the ideal shape and position to get maximum results.įrom the stack and reach values, we can also compare the character of the cycling position. Reach values that are much greater than the stack are usually found on racing bicycles or bicycles that aim for speed.įor professional cyclists, knowing the ideal stack and reach (whether for power or speed) is important. If the reach increases, the sitting position becomes more bent, aerodynamic and the body stretches (if the stack is fixed).The stack value that is closer to the reach value is usually found on bicycles that require long-term comfort. As the stack value increases, the sitting position usually becomes more relaxed and upright (if reach remains).Racing bikes, for example, usually have a short stack and long reach, while more relaxed bikes have a longer stack and shorter reach. Mountain bikes and racing bikes have different characters and also have different stack and reach ratios.
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