Missouri does not have a suspension lift law or a vehicle frame height limit, however, bumper height is restricted depending on the vehicle’s GVWR. As long as bumper height is kept legal, residents of Missouri are free to modify their vehicles by installing suspension lift kits, aftermarket wheels and tires, performance shocks, aftermarket bumpers, and grille guards.
 Code |
Missouri details its street legal laws in the Missouri Revised Statutes (MRS). |
MRS Ch. 307 | ||||||||||||||||||||
 Dimensions |
In Missouri, vehicles must be no bigger than 102 inches wide, 14 feet tall, and 45 feet long for a single vehicle. |
MRS 304-170 | ||||||||||||||||||||
 Tires |
All tires on vehicles driven in Missouri must be safe. There is no listed minimum tire tread depth or mention of tire grooving in the laws. |
MRS 307-172 | ||||||||||||||||||||
 Wheels |
Wheels are not covered in Missouri’s statutes. |
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 Brakes |
Vehicles driven in Missouri are required to have functional brakes. A secondary, mechanical, parking brake is required. |
MRS 307-170 | ||||||||||||||||||||
 Steering |
Missouri does not have any steering related laws. |
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 Suspension |
There are no specific suspension laws in Missouri. |
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 Frame |
The street legal laws in Missouri do not list a maximum frame height. |
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 Bumpers |
Missouri requires that bumpers be at least 4.5 inches tall. Bumper height is limited according to the vehicle’s GVWR.
( Measured to the bottom of the bumper. ) |
MRS 307-172 | ||||||||||||||||||||
 Fenders |
Fenders and mud flaps are only required on commercial vehicles in Missouri. |
MRS 307-015 | ||||||||||||||||||||
 Lights |
In addition to headlights and tail lights, vehicles in Missouri are allowed to have additional lights installed. When a vehicle is equipped with extra lighting, no more than 4 front lights can be on at one time while driving.
( Measured to the center of the light. ) |
MRS 307-045 MRS 307-075 MRS 307-090 MRS 307-080 MRS 307-105 MVI Manual |
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 Windows |
It is unclear if windshields are required in Missouri, however, vehicles with windshields must have windshield wipers. |
MVI Manual | ||||||||||||||||||||
 Exhaust |
In Missouri, vehicles are required to be equipped with mufflers. Exhaust cutouts and bypasses are not allowed to be installed. |
MRS 307-170 | ||||||||||||||||||||
 Engine |
Engine modifications and engine swaps are not covered in Missouri’s laws. |
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 Emissions |
5 counties in Missouri currently require emissions testing. |