diff --git a/Projects/Strasse/geometry/strasse_optimized.detector b/Projects/Strasse/geometry/strasse_optimized.detector
index 24ec3c2a6cc569e2ef6bab47ef8deead23f23cff..25d406002960ee1eb443f6765b7211af03da5ee9 100644
--- a/Projects/Strasse/geometry/strasse_optimized.detector
+++ b/Projects/Strasse/geometry/strasse_optimized.detector
@@ -74,7 +74,7 @@ Alias OuterPhi
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 Strasse Outer
   Radius= 61 mm
-  Z= 91.0 mm
+  Z= 78.0 mm
   Phi= @OuterPhi deg
   Shift= 0 mm
   Ref= 0 0 0 mm
diff --git a/Projects/Strasse/geometry/strasse_ref.detector b/Projects/Strasse/geometry/strasse_ref.detector
index b7c461a35bdb10d8fec0d22b3f4d07cec4d9ada6..c542cea82b01d10d2d9cb363efe2cbae423ed81a 100644
--- a/Projects/Strasse/geometry/strasse_ref.detector
+++ b/Projects/Strasse/geometry/strasse_ref.detector
@@ -72,7 +72,7 @@ Alias OuterPhi
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 Strasse Outer
   Radius= 60 mm
-  Z= 91.0 mm
+  Z= 78.0 mm
   Phi= @OuterPhi deg
   Shift= 0 mm