diff --git a/Detector/DetCRD/compact/CRD_o1_v02/CRD_Dimensions_v01_02.xml b/Detector/DetCRD/compact/CRD_o1_v02/CRD_Dimensions_v01_02.xml
index 0ef534ce04ff16c208695f5d74661f21c30ce392..9e1f0dfa7101e03aa7009450655dcfd195b5c667 100644
--- a/Detector/DetCRD/compact/CRD_o1_v02/CRD_Dimensions_v01_02.xml
+++ b/Detector/DetCRD/compact/CRD_o1_v02/CRD_Dimensions_v01_02.xml
@@ -83,14 +83,23 @@
<constant name="DC_Endcap_z" value="0.1*mm"/>
<constant name="DC_half_length" value="2225*mm" />
+ <constant name="DC_safe_distance" value="0.2*mm"/>
+ <constant name="DC_inner_chamber_layer_rbegin" value="235*mm"/>
+ <constant name="DC_inner_chamber_layer_rend" value="905*mm"/>
+ <constant name="DC_outer_chamber_layer_rbegin" value="1085*mm"/>
+ <constant name="DC_outer_chamber_layer_rend" value="1715*mm"/>
+ <constant name="DC_inner_chamber_radius_min" value="DC_inner_chamber_layer_rbegin"/>
+ <constant name="DC_inner_chamber_radius_max" value="909*mm"/>
+ <constant name="DC_outer_chamber_radius_min" value="DC_outer_chamber_layer_rbegin"/>
+ <constant name="DC_outer_chamber_radius_max" value="1716*mm"/>
<constant name="MainTracker_half_length" value="DC_half_length+DC_Endcap_z" />
<constant name="InnerTracker_half_length" value="DC_half_length" />
- <constant name="InnerTracker_inner_radius" value="234.8*mm"/>
- <constant name="InnerTracker_outer_radius" value="908.8*mm"/>
+ <constant name="InnerTracker_inner_radius" value="234*mm"/>
+ <constant name="InnerTracker_outer_radius" value="DC_inner_chamber_radius_max"/>
<constant name="OuterTracker_half_length" value="DC_half_length"/>
- <constant name="OuterTracker_inner_radius" value="1084.8*mm"/>
- <constant name="OuterTracker_outer_radius" value="1717.8*mm"/>
-
+ <constant name="OuterTracker_inner_radius" value="DC_outer_chamber_radius_min-DC_safe_distance"/>
+ <constant name="OuterTracker_outer_radius" value="1720*mm"/>
+
<constant name="SIT1_inner_radius" value="140*mm"/>
<constant name="SIT1_half_length" value="368.00*mm"/>
<constant name="SIT2_inner_radius" value="225*mm"/>