The IMU is an inertial platform optional of GRIPONE S3, CHRONO TC and GRIPONE P3 that permit the ECU to activate all the proces of 3D-INTELLIGENCE technology. The positioning of the IMU on the bike is very important. If it is not done in the correct manner, the control unit may not work. The IMU must be positioned (possibly) in the front of the bike and the most possible to the center (not to the right or left). On the IMU you can see two arrows pointing to the Z axis and the axis Y. The Y arrow must point in the direction of motion of the bike (as horizontal as possible). The Z arrow should be pointing the ground (as upright as possible)
NOTE: the unit GRIPONE S3, CHRONO TCand GRIPONE P3 can works properly even without the IMU.