Iowa Code 321.440 – Restrictions as to tire equipment
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1. Every solid rubber tire on a vehicle shall have rubber on its entire traction surface at least one inch thick above the edge of the flange of the entire periphery. Any pneumatic tire on a vehicle shall be considered unsafe if it has:
a. Any part of the ply or cord exposed.
b. Any bump, bulge or separation.
c. A tread design depth of less than one-sixteenth of an inch measured in any two or more adjacent tread grooves, exclusive of tie bars or, for those tires with tread wear indicators, worn to the level of the tread wear indicators in any two tread grooves.
d. A marking “not for highway use”, “for racing purposes only”, “unsafe for highway use”.
e. Tread or sidewall cracks, cuts or snags deep enough to expose the body cord.
f. Such other conditions as may be reasonably demonstrated to render it unsafe.
g. Been regrooved or recut below the original tread design depth, excepting special tires which have extra under tread rubber and are identified as such, or if a pneumatic tire was originally designed without grooves or tread.
Terms Used In Iowa Code 321.440
- highway: means the entire width between property lines of every way or place of whatever nature when any part thereof is open to the use of the public, as a matter of right, for purposes of vehicular travel, except in public areas in which the boundary shall be thirty-three feet each side of the center line of the roadway. See Iowa Code 321I.1
- Vehicle: means any vehicle as defined in chapter 321. See Iowa Code 321H.2
2. A vehicle, except an implement of husbandry, equipped with either solid rubber or pneumatic tires shall not be operated where the weight per inch of tire width is greater than five hundred seventy-five pounds per inch of tire width based on the tire width rating, except on a steering axle, in which case six hundred pounds per inch of tire width is permitted based on the tire width rating.