I am edit sbr, and when the speed more than 331mph, the tires will broken, so I wanna made a stronger tires, but I don't know change the code...... and here is the Jbeam of the tires
so your just asking us to make the tires stronger for you. Look here before you ask for help. there is a whole WIKI section for a reason. https://wiki.beamng.com/JBeam_Introduction
Doing that is not helping so much as it is the jbeam that is actual tire while mesh is just decoration of it, so you need to make jbeam stronger. Deformation and strength values are something to experiment with. More node weight and spring might be needed, but with those it becomes very complex very fast.
