diff --git a/selfdrive/car/hyundai/interface.py b/selfdrive/car/hyundai/interface.py
index c38f54923d..bde37e10bf 100644
--- a/selfdrive/car/hyundai/interface.py
+++ b/selfdrive/car/hyundai/interface.py
@@ -41,6 +41,7 @@ class CarInterface(CarInterfaceBase):
       ret.mass = 1513. + STD_CARGO_KG
       ret.wheelbase = 2.84
       ret.steerRatio = 13.27 * 1.15   # 15% higher at the center seems reasonable
+      tire_stiffness_factor = 0.65
       ret.lateralTuning.pid.kiBP, ret.lateralTuning.pid.kpBP = [[0.], [0.]]
       ret.lateralTuning.pid.kpV, ret.lateralTuning.pid.kiV = [[0.25], [0.05]]
     elif candidate == CAR.SONATA_2019: