diff --git a/selfdrive/car/hyundai/interface.py b/selfdrive/car/hyundai/interface.py
index 6d9054a59f..ce25efce62 100644
--- a/selfdrive/car/hyundai/interface.py
+++ b/selfdrive/car/hyundai/interface.py
@@ -74,6 +74,7 @@ class CarInterface(CarInterfaceBase):
       ret.mass = 1999. + STD_CARGO_KG
       ret.wheelbase = 2.90
       ret.steerRatio = 15.6 * 1.15
+      tire_stiffness_factor = 0.63
       ret.lateralTuning.pid.kiBP, ret.lateralTuning.pid.kpBP = [[0.], [0.]]
       ret.lateralTuning.pid.kpV, ret.lateralTuning.pid.kiV = [[0.3], [0.05]]
     elif candidate in [CAR.ELANTRA, CAR.ELANTRA_GT_I30]: