Mass

Summary
Mass is the total mass of the car. The mass of the vehicle will be measured in Roblox Mass Units (RMU or MU). The mass does not count for add-ons or extra parts. You will use the mass tool shown here. Be sure to put it inside the vehicle and press 'Run' as to get the active weight of the vehicle. If the tool says that the weight might be heavier, just put the word over next to the comparison. If you can not find it, just put Unknown (If it is impossible to find) or Unavailable (If you just cannot access it at the moment).

Mass Levels (Rounded)
Below Player Weight: < 12 RMU

Player Weight: 12 - 15 RMU

Extra Player Weight: 16 - 20 RMU

Reduced Lightweight: 21 - 40 RMU

Reduced Mid-weight: 41 - 60 RMU

Reduced Heavyweight: 61 - 84 RMU

Natural Lightweight: 85 - 284 RMU

Natural Mid-weight: 285 - 484 RMU

Natural Heavyweight: 485 - 684 RMU

Truck: 685 - 849 RMU

Truck+: 850 - 999 RMU

Tank: > 1000 RMU