While turning tire 3 to tire axis of rotation 1, the tire motor the rpm measurement expedient the drum motor with the speedometer 15 which measures 11 to which around 6 which measures 5 which makes tire rpm rise Nt and tire rpm Nt and drum axis of rotation 14 turns travelling drum 12 at fixed drum speed Vd and drum speed Vd and tire load Fz tire 3 the load grant expedient the front and back power load cell 2 which measures the front and back power Fx which works in the load load cell 2 which measures 4 which pressure welding it can point in travelling drum 12 and tire load Fz and tire 3 and,Drum speed Vd, connecting with the plural times during the time when it has made tire rpm Nt and the tire rpm rise Nt which measured the measurement result of front and back power Fx and tire load Fz, it possesses with the record expedient which it records.
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