IS MY MOD LEGAL?

Wheel & Tire Protrusion in Massachusetts

Conditional

Massachusetts expressly permits tires to extend beyond the fenders or body — it just requires flaps or suitable guards when they do, to reduce spray to the rear and sides.

Verified against primary sources · August 2026

What the law says

The inspection rule applies to passenger vehicles under 10,000 lb GVWR except four-wheel-drive vehicles, and separately requires front and rear fenders to be in place on post-1949 vehicles designed for them.

Specific Limits

Protrusion limit
none — tires may extend beyond the fenders if flaps or guards are fitted

Statute

Mass. Gen. Laws c. 90, § 7; 540 CMR 4.04(12)(b)

Read the statute →

Frequently Asked Questions

Are wheel & tire protrusion legal in Massachusetts?
Massachusetts expressly permits tires to extend beyond the fenders or body — it just requires flaps or suitable guards when they do, to reduce spray to the rear and sides.
What are the exact wheel & tire protrusion limits in Massachusetts?
Protrusion limit: none — tires may extend beyond the fenders if flaps or guards are fitted. Source: Mass. Gen. Laws c. 90, § 7; 540 CMR 4.04(12)(b).

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