IS MY MOD LEGAL?

Wheel & Tire Protrusion in Washington

Conditional

Washington requires fenders, covers, flaps, or splash aprons adequate to minimize rear spray on every motor vehicle — and the device must be at least as wide as the tire behind which it is mounted, extending downward at least to the center of the axle.

Verified against primary sources · August 2026

What the law says

Vehicles 40 years old or more and street rods driven in fair weather on hard-surfaced roads are exempt.

Specific Limits

Fenders required
at least as wide as the tire and extending down at least to the center of the axle
Protrusion limit
none

Statute

RCW 46.37.500

Read the statute →

Frequently Asked Questions

Are wheel & tire protrusion legal in Washington?
Washington requires fenders, covers, flaps, or splash aprons adequate to minimize rear spray on every motor vehicle — and the device must be at least as wide as the tire behind which it is mounted, extending downward at least to the center of the axle.
What are the exact wheel & tire protrusion limits in Washington?
Fenders required: at least as wide as the tire and extending down at least to the center of the axle. Protrusion limit: none. Source: RCW 46.37.500.

Street-legal wheel & tire protrusion picks

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