Wheel & Tire Protrusion in Montana
Montana requires fenders, splash aprons, or flaps on the rearmost wheels of every vehicle except motorcycles, quadricycles, motor-driven cycles, and farm tractors — but sets no limit on how far a tire may protrude.
Verified against primary sources · August 2026
What the law says
The device must arrest and deflect thrown debris and reach within 20 inches of the road surface (10 inches on vehicles over 8,000 lb GVW). Street rods and vehicles never originally so equipped are exempt.
Specific Limits
- Spray control
- fenders, splash aprons, or flaps reaching within 20 in of the road (10 in over 8,000 lb GVW)
- Protrusion limit
- none
Exceptions & Exemptions
No specific Montana statute found regarding wheel protrusion limits
Frequently Asked Questions
Are wheel & tire protrusion legal in Montana?
What are the exact wheel & tire protrusion limits in Montana?
Are there exceptions for wheel & tire protrusion in Montana?
Street-legal wheel & tire protrusion picks
Gear that helps you mod without a ticket in Montana.
The standard fix when wheels stick out past the fender line.
Shop on AmazonSeveral states require them once tires extend beyond the body.
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