What is the grippiest material in gmod/source?

I know you can select additional materials for the physical properties tool by “physprop_material <material>” however I remember reading once on the forums that someone had made a car with the “jeeptyre” material on the wheels, and someone posted there was a even grippier material in GMod, however they didn’t say what it was.
Does anyone know?

physprop_material jalopytire


Thankyou :smile:

Well, this is nice to know. I won’t need to make my vehicles several-ton behemoths anymore to get some friction.

The grippiest one that isnt squeaky lol is the phx_tire_normal thing idk if thats exactly how you type it. I know its the grippiest because there is a chart

Better late than never?