Retractable Tire Blades: $250, 30lbs, 1 space, 0 DP.
This is something from James Bond and I included it in my replica of the Aston Martin DBV.
above are for the brushcutter, and while in general I think things should weigh more, I'm
also a stickler for consistency. The other model is the retractable wheelguards which are $250, 50lbs, and 1space per pair, which I'll add to this as well, but instead of front/back, "pair" will be per side.
So, proposed rules are that once the blades are deployed, the car cannot turn the wheels or the blades will break. Once extended, any vehicle component next to the blade will take 1d6 worth of damage per second of contact, depending on a 1d6 roll: 1-2 front tire, 3-4 side armor, 5-6 rear tire. If tire is targeted, then WG/WH will be affected in their same rate as other targeting. The attacking car sustains a D1 hazard, the targeted car sustains a D2.
Again, these rules are proposed. This really needs to be playtested.
UPDATE: Reader "Pat G" suggests this modification, which I think makes sense: "can only make D1 maneuvers"- which would allow drifts into the target.