Weighing in at 18.5 pounds the one piece replacement eliminates the 2piece shaft and close to 15 pounds. The shaft is fitted with forged steel tube yokes, welded to within .005″ runout. We do offer an Aluminum yoke upgrade which will save 2.6 lbs. of weight. The shaft balanced to less than 1/8 in/oz. for smooth operation throughout the entire speed range. The shafts have been track tested to over 170 MPH.