loads other than the direction of steer to the handlebar, the measurement with high accuracy cannot be done. Then, the gauge is pasted to four places of the direction where the steering wheel is rotated the steer, and four active gauge method is used as a connection method to the bridged circuit. The steering torque is recorded by TEAC es8 at 100Hz sampling frequency. The bend can be output by the twice while deleting compression, hitching and twist by using this connection method. When the relation between these measured swerve and steering wheel torque is proofread, it comes to be able to specify the steering wheel torque only by measuring the swerve. The steering wheel torque can be requested as follows. T F F L SR SL S = + ×) ( ST : Steering wheel torque : Load to handlebar of steering wheel axis with left hand : Load to handlebar of steering wheel axis with right hand SL F SR F L:Length from steer axis to action point of handlebar load Fig. 3 Kawasaki ZRX400 Fig. 4 KYOWA KFG-3-120-D16-11L3M2S Table 1 Specification of experimental motorcycle Detail ZRX400 (Kawasaki) Overall length 2100 [mm] Overall width 755 [mm] Overall height 1095 [mm] Wheelbase 1440 [mm] Minimum ground clearance 120 [mm] Total weight 198 [kg] 4. Experimental method To examine the relation between the corner radius and the steering torque, we measured the steering torque when running the corner of 5m in the radius and 10m. The motorcycle speed was assumed to be 15km/h when 5m in radius, 20km/h when 10m in radius. These are the speeds that can start most smoothly in each corner. Figure 6 illustrates the experimental method. The motorcycle accelerated enough in the straight-line before it entered the corner and the speed did not fall when the corner running. 493
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