Montana Lift Laws and Vehicle Equipment Laws

The Montana Code (MC) explains the street legal laws for the state.

The maximum vehicle size in Montana is 102 inches wide, 14 feet tall, and 55 feet long for a single vehicle.

Tires must be in safe operating condition, without any bulges or exposed cords. Montana has no listed minimum tire tread depth. It is unclear if grooved tires are permitted.

Montana’s code makes no reference to wheels.

All vehicles in Montana must have brakes capable of stopping the vehicle from a speed of 20 mph within 25 feet. A secondary, mechanical, parking brake is also required.

Montana does not have any rules for a vehicle’s steering system.

There are no suspension laws in Montana.

Montana does not have a vehicle frame height limit.

All cars and trucks in Montana are required to have bumpers.

Fenders and mud flaps are required in Montana.

In addition to headlights and tail lights, vehicles in Montana are allowed to have auxiliary lighting. A maximum of 4 front lights can be turned on while driving.

( Measured to the center of the light. )

Montana’s code requires windshield wipers. Windshields are not required if the driver wears safety glasses or goggles at all times when driving the vehicle.

In Montana, vehicles are required to be equipped with mufflers. It is unlawful to install any kind of exhaust cutout or bypass.

It is unclear whether or not Montana has any engine swap or engine performance modification rules.

Montana does not currently require emissions testing.