Michigan has street legal laws that limit a vehicle’s frame height and bumper height. Lift blocks are not allowed on front springs, and rear lift blocks are limited to 4 inches. While keeping within these restrictions, Michigan drivers are allowed to install suspension lift kits, aftermarket wheels and tires, performance shocks, aftermarket bumpers, and grille guards.
 Code |
The Michigan Compiled Laws (MCL) define the street legal laws for the state. |
MCL Ch. 257 | ||||||||||||||||||||
 Dimensions |
Vehicle dimensions in Michigan are limited to an overall width of 102 inches, a height of 13 feet 6 inches, and a single vehicle length of 45 feet. The width of a vehicle’s body is limited to 96 inches. |
MCL 257-717 MCL 257-719 |
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 Tires |
Michigan requires that all tires be in safe condition. Tires must not have any exposed cords or bulges. There is a minimum tire tread depth of 1/16 inch. Tires are allowed to be grooved , just not any deeper than the original tread depth. |
MCL 257-710 | ||||||||||||||||||||
 Wheels |
There are no laws specifically related to wheels found in Michigan’s laws. |
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 Brakes |
Vehicles driven in Michigan are required to have brakes on all 4 wheels. The brakes must be capable of stopping the vehicle from a speed of 20 mph within 30 feet. A secondary, mechanical, parking brake is also required. |
MCL 257-705 | ||||||||||||||||||||
 Steering |
Michigan requires that a vehicle’s steering system retains the factory geometry. It is unlawful to weld on pitman arms, drag links, or tie rods. |
MCL 257-710C | ||||||||||||||||||||
 Suspension |
In Michigan, front lift blocks are prohibited. Rear lift blocks must be one piece and cannot be more than 4 inches tall. Spring shackles cannot be more than 2 inches longer than stock. |
MCL 257-710C | ||||||||||||||||||||
 Frame |
The maximum vehicle frame height in Michigan depends on the vehicle’s GVWR.
( Measured to the bottom of the frame at midway between front and rear axles. ) |
MCL 257-710C | ||||||||||||||||||||
 Bumpers |
Vehicle bumper height in Michigan is limited according to the vehicle’s GVWR.
( Measured to the bottom of the bumper at highest point. ) |
MCL 257-710C | ||||||||||||||||||||
 Fenders |
It unknown if fenders or mud flaps are required in Michigan. |
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 Lights |
In addition to headlights and tail lights, vehicles in Michigan are allowed to have auxiliary lights. 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. ) |
MCL 257-685 MCL 257-686 MCL 257-969 MCL 257-685 |
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 Windows |
All vehicles are required to have windshields and windshield wipers in Michigan. |
MCL 257-708A MCL 257-709 |
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 Exhaust |
Mufflers are required on all vehicles in Michigan. Exhaust cutouts and bypasses are prohibited. |
MCL 257-707 | ||||||||||||||||||||
 Engine |
It is unclear whether or not Michigan has any engine swap or engine performance modification rules. |
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 Emissions |
Michigan does not require emissions testing. |