Incorrect Front Ride Height

Hello,
I'm developing a formula car physics, but I run into an issue, and I don't what causing it.

The problem is, that the Undertray0-1's y coordinate is 0, but my front ride height is higher with 4 cm than in the setup.
Have anyone an idea why or what should I try to fix this?

Thank you for the help: Lajos Szabados

 

Then you have to move the 3d model of the front tires so that they match the rears I guess.

 

So if the model's rearend in the model is 4 cm high instead of 0, then I will get 4 cm higher front height. Am I correct?

Edit: we made the modification but it doesn't work. I changed the HDV to could try the with lower Ride Height but it seems like the 6.7 cm is the minimum. I can't lower the front of the car. I set the front ride height to a negative value (-4 cm) but the front height (based on motec telemetry data) is still 6.7 cm. I hoe somebody has an idea, how to fix it. (the pm file works correctly in rF1)

 

Check your suspension bump travel.

 

I found the solution. It was the wheel radius in the tbc.

 

What? I thought it's not used by player's physics.