diff --git a/src/geometry/sidechain.py b/src/geometry/sidechain.py
new file mode 100644
index 0000000..3bb0b42
--- /dev/null
+++ b/src/geometry/sidechain.py
@@ -0,0 +1,8 @@
+GEO = {
+    'CA_CB_length': 1.53,
+
+    'N_CA_CB_angle': 109.5,
+    'C_CA_CB_angle': 109.5,
+
+    'L_torsion': 122.55
+}
\ No newline at end of file