That is true...Our RP is fixed mounted on a welded in mount. I have a math channel on our Racepak that corrects the static G-Meter reading to zero. There are other channels that are based partly on the G reading so it's good to ensure it starts at zero in order that the other channels are accurate.The good thing about the rollbar mounts is you can "zero" the G meter with the racepak live telemetry turned on. When I turned on the racepak initially was showing a few hundredths on the acceleration reading with the car sitting still and called racepak and was told to rotate the brackets until the reading showed zero. I know this sounds nit-picking but it was pretty cool to be able to adjust this just by rotating the brackets a little.