diff --git a/src/segway_RMP400.h b/src/segway_RMP400.h
index 67b66e38fc278f0674847a57b4a1cefda279a6e6..80647b5eb2f75ba64c494f1bcecbfdaf5245c864 100644
--- a/src/segway_RMP400.h
+++ b/src/segway_RMP400.h
@@ -8,7 +8,7 @@
 #include <iostream>
 
 #define RMP400_b 0.54 // distance between weels for one rmp unit in meters
-#define RMP200_DEFAULT_WHEEL_RADIUS 0.24
+#define RMP200_DEFAULT_WHEEL_RADIUS 0.265
 
 const unsigned int NUM_SEGWAY_200 = 2;
 
@@ -58,7 +58,7 @@ class CSegwayRMP400
     /**
      * \brief default rmp400 wheel radius when inflated to 10 psi (in meters)
      */
-    static const float default_wheel_radius_ = 0.26;
+    static const float default_wheel_radius_ = 0.265;
 
     /**
      * \brief wheel radius in meters