F.I.S.T. Bar to Head Tube Calculator
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All values are in millimeters!
+ +The calculator above is designed to help fitters trained in the F.I.S.T. tri + bike fit protocol to generate geometries for custom triathlon bikes. Note + that the inputs required to use this calculator include "stack" and "reach." + These values are described at length in our tri bike fit articles on Slowtwitch.com. +
++ Even if the fit is performed correctly, pitfalls loom. You must have the + tools to accurately find the stack and reach of the bike that fits under the + rider. The fitter is required to account for the stem length, stem pitch, + height of the stem clamp, headset upper stack, spacers under the stem if + any, and of course the choice of aerobar. He then must have an accurate way + of generating the stack and reach measures, using either a fit bike (best is + the bike made by Exit Cycling) that accurately generates these values + (taking into consideration negative reach if applicable), or he must use an external tool, such + as Serotta's X/Y tool. +
+TERMS OF USE
++ + This calculator consists of a set of trigonometric and geometric equations. + It solves math equations. That's all it does. There are no warranties + expressed or implied that these geometries cause a bike to be safe, or + comfortable, or powerful, or aerodynamic, or even be ridden; or indeed can + even be built. Should you build or cause to build a bike based on + geometries calculated by this generator, you do so at your own risk. You + agree to hold harmless Slowtwitch.com, its owners, employees and contractors + against all claims arising out of your use of this calculator. You agree to + assume all risk and liability associated with using this calculator. You + agree that the final determination of an appropriate geometry rests with you + and/or any customer for whom you may be building this bike, or causing it to + be built, and with the company building the bike. +
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