diff --git a/Assets/VRM/Runtime/SkinnedMeshUtility/VRMBoneNormalizer.cs b/Assets/VRM/Runtime/SkinnedMeshUtility/VRMBoneNormalizer.cs
index d15039a33..65b2a6b7a 100644
--- a/Assets/VRM/Runtime/SkinnedMeshUtility/VRMBoneNormalizer.cs
+++ b/Assets/VRM/Runtime/SkinnedMeshUtility/VRMBoneNormalizer.cs
@@ -152,7 +152,7 @@ namespace VRM
                     dstColliderGroup.Colliders = src.Colliders.Select(y =>
                     {
                         var offset = dst.worldToLocalMatrix.MultiplyPoint(src.transform.localToWorldMatrix.MultiplyPoint(y.Offset));
-                        var ls = src.UniformedLossyScale;
+                        var ls = src.transform.UniformedLossyScale();
                         return new VRMSpringBoneColliderGroup.SphereCollider
                         {
                             Offset = offset,
diff --git a/Assets/VRM/Runtime/SpringBone/TransformExtensions.cs b/Assets/VRM/Runtime/SpringBone/TransformExtensions.cs
new file mode 100644
index 000000000..7a49c5b32
--- /dev/null
+++ b/Assets/VRM/Runtime/SpringBone/TransformExtensions.cs
@@ -0,0 +1,16 @@
+using UnityEngine;
+
+namespace VRM
+{
+    public static class TransformExtensions
+    {
+        public static float UniformedLossyScale(this Transform transform)
+        {
+            return Mathf.Max(
+                Mathf.Max(transform.lossyScale.x,
+                transform.lossyScale.y),
+                transform.lossyScale.z
+            );
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/VRM/Runtime/SpringBone/TransformExtensions.cs.meta b/Assets/VRM/Runtime/SpringBone/TransformExtensions.cs.meta
new file mode 100644
index 000000000..897246d85
--- /dev/null
+++ b/Assets/VRM/Runtime/SpringBone/TransformExtensions.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: d5465187646dee944ac1bc45ddf0fc7a
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM/Runtime/SpringBone/VRMSpringBone.cs b/Assets/VRM/Runtime/SpringBone/VRMSpringBone.cs
index 717f134a3..da422b765 100644
--- a/Assets/VRM/Runtime/SpringBone/VRMSpringBone.cs
+++ b/Assets/VRM/Runtime/SpringBone/VRMSpringBone.cs
@@ -85,7 +85,11 @@ namespace VRM
 
             private Quaternion LocalRotation { get; }
 
-            public float Radius { get; set; }
+            float m_radius;
+            public void SetRadius(float radius)
+            {
+                m_radius = radius * m_transform.UniformedLossyScale();
+            }
 
             private Quaternion ParentRotation =>
                 m_transform.parent != null
@@ -139,12 +143,12 @@ namespace VRM
             {
                 foreach (var collider in colliders)
                 {
-                    var r = Radius + collider.Radius;
+                    var r = m_radius + collider.Radius;
                     if (Vector3.SqrMagnitude(nextTail - collider.Position) <= (r * r))
                     {
                         // ヒット。Colliderの半径方向に押し出す
                         var normal = (nextTail - collider.Position).normalized;
-                        var posFromCollider = collider.Position + normal * (Radius + collider.Radius);
+                        var posFromCollider = collider.Position + normal * (m_radius + collider.Radius);
                         // 長さをboneLengthに強制
                         nextTail = m_transform.position + (posFromCollider - m_transform.position).normalized * m_length;
                     }
@@ -152,7 +156,7 @@ namespace VRM
                 return nextTail;
             }
 
-            public void DrawGizmo(Transform center, float radius, Color color)
+            public void DrawGizmo(Transform center, Color color)
             {
                 var currentTail = center != null
                         ? center.TransformPoint(m_currentTail)
@@ -163,13 +167,14 @@ namespace VRM
 
                 Gizmos.color = Color.gray;
                 Gizmos.DrawLine(currentTail, prevTail);
-                Gizmos.DrawWireSphere(prevTail, radius);
+                Gizmos.DrawWireSphere(prevTail, m_radius);
 
                 Gizmos.color = color;
                 Gizmos.DrawLine(currentTail, m_transform.position);
-                Gizmos.DrawWireSphere(currentTail, radius);
+                Gizmos.DrawWireSphere(currentTail, m_radius);
             }
         }
+
         List<VRMSpringBoneLogic> m_verlet = new List<VRMSpringBoneLogic>();
 
         void Awake()
@@ -302,7 +307,7 @@ namespace VRM
 
             foreach (var verlet in m_verlet)
             {
-                verlet.Radius = m_hitRadius;
+                verlet.SetRadius(m_hitRadius);
                 verlet.Update(m_center,
                     stiffness,
                     m_dragForce,
@@ -317,7 +322,9 @@ namespace VRM
             if (!m_drawGizmo) return;
 
             foreach (var verlet in m_verlet)
-                verlet.DrawGizmo(m_center, m_hitRadius, m_gizmoColor);
+            {
+                verlet.DrawGizmo(m_center, m_gizmoColor);
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/Assets/VRM/Runtime/SpringBone/VRMSpringBoneColliderGroup.cs b/Assets/VRM/Runtime/SpringBone/VRMSpringBoneColliderGroup.cs
index c7b44d23d..08c0eb7a1 100644
--- a/Assets/VRM/Runtime/SpringBone/VRMSpringBoneColliderGroup.cs
+++ b/Assets/VRM/Runtime/SpringBone/VRMSpringBoneColliderGroup.cs
@@ -31,23 +31,11 @@ namespace VRM
         [SerializeField]
         Color m_gizmoColor = Color.magenta;
 
-        public float UniformedLossyScale
-        {
-            get
-            {
-                return Mathf.Max(
-                    Mathf.Max(transform.lossyScale.x,
-                    transform.lossyScale.y),
-                    transform.lossyScale.z
-                );
-            }
-        }
-
         private void OnDrawGizmosSelected()
         {
             Gizmos.color = m_gizmoColor;
             Matrix4x4 mat = transform.localToWorldMatrix;
-            var ls = UniformedLossyScale;
+            var ls = transform.UniformedLossyScale();
             Gizmos.matrix = mat * Matrix4x4.Scale(new Vector3(
                 1.0f / transform.lossyScale.x * ls,
                 1.0f / transform.lossyScale.y * ls,