How on earth would you hook up a pressure sensor the rear suspension? I guess you could put it in place of the nitrogen filler or provide some sor of 'y' fitting to get both on there at the same time. However, you would then have to do a lot of calculations on the raw data to determine rear wheel travel from the pressure. Some things you would have to take into account are:PressureTemperature of shock gasVolume vs. shock displacementrising rate of suspension linkageIt wloud get complicatedIn my opinion you'd want to use a linear displacement sensor. Something like this: http://www.pennyandgiles.com/linear-displacement-sensor-pd-109,3,,.phpIt would make your life very much easier.
I have not seen a way to measure travel that I feel would stand up to race conditions...
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