Iowa Code » Chapter 321 — MOTOR VEHICLES AND LAW OF THE ROAD
Iowa Code

Iowa Code § 321.442 (2026)

Projections on wheels

✓ current as of July 2026
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No tire on a vehicle moved on a highway shall have on its periphery any block, stud, flange, cleat, or spike or any other protuberances of any material other than rubber which projects beyond the tread of the traction surface of the tire except that it shall be permissible to use:

1. Farm machinery with tires having protuberances which will not injure the highway.

2. Tire chains of reasonable proportions upon any vehicle when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid.

3. Pneumatic tires with inserted ice grips or tire studs projecting not more than one-sixteenth inch beyond the tread of the traction surface of the tire upon any vehicle from\n\nTue Dec 09 22:17:00 2025 Iowa Code 2026, Chapter 321 (137, 2) §321.442, MOTOR VEHICLES AND LAW OF THE ROAD 238\n\nNovember 1 of each year to April 1 of the following year, except that a school bus and fire department emergency apparatus may use such tires at any time. [S13, §1571-1a; C24, 27, 31, 35, §5068, 5070; C39, §5034.51; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.442] Referred to in §805.8A(3)(am) For applicable scheduled fine, see §805.8A, subsection 3 \n

Notes of Decisions
Cited in 2 cases, 1966–2012 · leading case: Mitchell Cnty. v. Matthew Hoover Zimmerman, 810 N.W.2d 1 (Iowa 2012).
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Mitchell Cnty. v. Matthew Hoover Zimmerman, 810 N.W.2d 1 (Iowa 2012). · cites it 19× “Iowa Code § 321.442 (2009). However, a Mitchell County supervisor testified that “the penalty there is only a $10 fine, which .”
Kruck v. Needles, 144 N.W.2d 296 (Iowa 1966). · cites it 20× “The question presented in this declaratory-judgment action is whether section 321.442, Code, 1962, prohibits use of automobile tires containing metal inserts, referred to as safety spike winter tires.”
— Iowa Code § 321.442(1) — 1 case
Mitchell Cnty. v. Matthew Hoover Zimmerman, 810 N.W.2d 1 (Iowa 2012). “Iowa Code § 321.442 (2009). However, a Mitchell County supervisor testified that “the penalty there is only a $10 fine, which .”
— Iowa Code § 321.442(2) — 1 case
Mitchell Cnty. v. Matthew Hoover Zimmerman, 810 N.W.2d 1 (Iowa 2012). “Iowa Code § 321.442 (2009). However, a Mitchell County supervisor testified that “the penalty there is only a $10 fine, which .”
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