diff --git a/selfdrive/car/mazda/interface.py b/selfdrive/car/mazda/interface.py
index 6555ba317678e6..091a2e61cc0c23 100755
--- a/selfdrive/car/mazda/interface.py
+++ b/selfdrive/car/mazda/interface.py
@@ -83,7 +83,7 @@ def _get_params(ret, candidate, fingerprint, car_fw, experimental_long, docs):
       ret.lateralTuning.torque.latAngleFactor = .14
     elif candidate in (CAR.CX_30, CAR.CX_50):
       ret.mass = 3375 * CV.LB_TO_KG + STD_CARGO_KG
-      ret.wheelbase = 2.7
+      ret.wheelbase = 2.814 # Measured
       ret.steerRatio = 15.5
       ret.lateralTuning.torque.latAngleFactor = .14
     elif candidate in (CAR.CX_60, CAR.CX_80, CAR.CX_70, CAR.CX_90):