diff --git a/ergoCubSN000/hardware/mechanicals/right_arm-eb1-j0_1-mec.xml b/ergoCubSN000/hardware/mechanicals/right_arm-eb1-j0_1-mec.xml
index 16ccc85bdd..c530b4385e 100644
--- a/ergoCubSN000/hardware/mechanicals/right_arm-eb1-j0_1-mec.xml
+++ b/ergoCubSN000/hardware/mechanicals/right_arm-eb1-j0_1-mec.xml
@@ -11,7 +11,7 @@
         <param name="Encoder">                  182.044             182.044             </param>
         <param name="fullscalePWM">             32000               32000               </param>
         <param name="ampsToSensor">             1000.0              1000.0              </param>
-        <param name="Gearbox_M2J">              -100.00             -160.00             </param>
+        <param name="Gearbox_M2J">              -100.00             -100.00             </param>
         <param name="Gearbox_E2J">              64                  64                  </param>
         <param name="useMotorSpeedFbk">         1                   1                   </param>
         <param name="MotorType">                "MOOG-BL-C2900576"  "MOOG-BL-C2900576"  </param>