PSA:Add this value to severely decrease tire expansion and drive at ludicrous speeds:

Iv'e tried to make fast cars before, and so have a lot of other people. As far as Iv'e heard, no one could really figure out how to get rid of the tire expansion, I'm sure someone has, but I have not seen it. So I was trying to find what values to change and I stumbled upon deform values in the docs. I think these are supposed to be for the body of a car but you can use them for tires too.

Just add this line in the "tire options" tab in the tire properties:
{"deformLimit":0},

The tires expand a tiny bit, but always go back o their original state and can handle MUCH higher speeds. Was able to get completely stable tires at speeds upwards of 370 mph. I have not gone higher than that, though. I recommend you use this with the indestructible cars mod so tires don't actually pop/break if they can.

In case you are curious I did not mod the vanilla tires, I modded the tires from the ExtraGrip Tires mod so I didn't break the game when fiddling.

The van shown below is my "Same Day Delivery" van