1.With dial indicator gauge set to measure wheels lateral and radial run-out 2.Ensure more accurate measurement and makes wheel truing easier than before 3.For wheels from 16” to 29” with or without a tire. The wheel is not included 4.Able to installed on a workbench 5.Longer, stronger upright to accept wheels up to 29” with or without a tire. 6.Taller, more accurate calipers accept rim widths wide up to 4” 7.Accept hub width up to 180mm 8.Stronger more comfortable knobs 9.Uprights move simultaneously to accommodate front and rear wheels 10.Spring-loaded calipers and caliper arm prevent binding 11.Smooth, accurate operation