Direct sunshine on the tire and tire heating due to driving are a few examples of things that will affect the CIP. To get an accurate measurement of CIP the tire must be resting and not exposed to direct sunlight for at least 3 hours.
The Halo is a self-contained pump that generates pressure when rotated. It has a pendulum-like mass, similar to a self-winding watch, that hangs while the pump is rotating with the wheel. The relative rotational motion is used to create a pumping action.
A key design feature of the Halo is a smart regulator that ensures it will only pump air when the tire pressure is below the target pressure setting. So if the target pressure is 100 psi and the tire’s cold inflation pressure is 97 psi, the Halo will add air until the pressure is 100 psi and then the regulator will turn the pump off.
The Halo has been tested in a variety of climates, from winters in Canada to summers in Florida and everything in between. It has been designed to function in temperatures ranging from -40F to 257F (-40C to 125C).
The Halo will be compatible with the majority of class 7 & 8 tractors and trailer wheels, hubs and tires. The Halo device currently is NOT recommended for use on wheels with convex shape (e.g. the steer positions of Class 7 & 8 tractors/buses). The convex shape of the Steer tire wheel end makes the Halo device more difficult to safely mount via a bracket system. We are exploring options for this wheel position and should have a solution in the future.
The Halo weighs approximately 5 lbs. and will not cause wheel imbalance issues because it is mounted near the center of the wheel end (like a Hubodometer). In our real-world testing with numerous fleets spanning more than two years and driving over eight million miles, there has not been any incident where the Halo device caused noticeable wheel balance issues of any kind.