Equip your semi truck to be Ready for the Road Ahead with the Stemco 504 Rev/Mil Hubodometer, a key piece that offers accurate mileage tracking. By utilizing a sophisticated design that mounts to either an axle or hub, this replacement component is able to measure the overall distance that a vehicle has traveled. Built with exact details to accurately capture mileage data. FleetPride is your First Click in Heavy Duty .