Okla. Stat. tit. 47, § 47-12-405

operating condition.

A. Every solid rubber tire on a vehicle shall have rubber on

its entire traction surface at least one (1) inch thick above the

edge of the flange of the entire periphery.

B. A person shall not operate or move on any hard-surfaced

highway any vehicle having any metal tire in contact with the

roadway, except when authorized by special permit as provided in

subsection E of this section.

C. 1. Any tire on a vehicle moved on a highway shall not have

on its periphery any block, stud, flange, cleat or spike or any

other protuberance of any material other than rubber which projects

beyond the tread of the traction surface of the tire, except that it

shall be permissible:

a. to use farm tractors or implements of husbandry with

tires having protuberances which will not injure the

highway,

b. to use 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, or

c. for pneumatic tires equipped with or having on their

periphery studs of metal, porcelain or other material

to be sold or used in this state, if constructed to

provide resiliency upon contact with the road surface,

so that not more than three percent (3%) in the

aggregate of the traction surface of such tire be

composed of such studs and so that such studs do not

project more than three-thirty-seconds (3/32) of an

inch beyond the tread of the traction surface of such

tire and have a rate of wear which will so limit such

projection.

2. The exceptions permitted in paragraph 1 of this subsection

shall be subject to the following restrictions:

a. the use of such tires or tire chains shall be limited

to vehicles with rated capacities up to and including

two (2) tons,

Oklahoma Statutes - Title 47. Motor Vehicles Page 629

b. any tire so equipped shall not be used on a public

highway earlier than November 1 of each year or later

than April 1 of the following year, and

c. copies of this subsection shall be posted in all

places at which tires or tire chains are sold, and a

printed or written warning on the time limitation for

the use of such tires or tire chains shall be

furnished to each buyer, purchaser, or user by the

seller of such studded tires or tire chains.

D. Operator selectable "on demand" studded tires having

traction-enhancing studs located outside the normal tread area which

allows their operation as conventional tires on dry roads or as

studded tires on ice-coated roads by the expedient of reducing or

increasing the air pressure within the tires, shall be exempt from

the prohibitions of subsection C of this section with the following

exceptions:

1. The use of such tires shall be limited to vehicles with

rated capacities up to and including two (2) tons;

2. Any such tire shall not be deflated so that the studs lower

and make contact with the road surface earlier than November 1 of

each year or later than April 1 of the following year.

E. The Department of Public Safety and local authorities in

their respective jurisdictions may in their discretion issue special

permits authorizing the operation upon a highway of traction engines

or tractors having movable tracks with transverse corrugations upon

the periphery of such movable tracks or farm tractors or other farm

machinery, the operation of which upon a highway would otherwise be

prohibited under this section.

F. A person shall not operate any vehicle when one or more of

the tires in use on that vehicle is in unsafe operating condition or

has a tread depth less than two-thirty-seconds (2/32) inch measured

in any two adjacent tread grooves at three equally spaced intervals

around the circumference of the tire; provided, such measurements

shall not be made at the location of any tread wear indicator, tie

bar, hump, or fillet. In the event a citation is issued under this

subsection, the officer shall include the tread depth of the
as a tread depth less than two-thirty-seconds (2/32) inch measured

in any two adjacent tread grooves at three equally spaced intervals

around the circumference of the tire; provided, such measurements

shall not be made at the location of any tread wear indicator, tie

bar, hump, or fillet. In the event a citation is issued under this

subsection, the officer shall include the tread depth of the

offending tire on the citation. As used in this subsection, an

unsafe tire includes, but is not limited to, any tire:

1. On which the ply or cord is exposed in the tread area;

2. Which has been regrooved or recut below the original groove

depth, except tires that have been designed with under-rubber

sufficient for regrooving and are so marked;

3. Marked "Farm Implement Only", "Not for Highway Use", or any

other marking that would indicate that the tire is not for normal

highway use; provided, no such marking shall be altered or removed;

4. On which any bulges, bumps, or knots show in the tread or

sidewall area; or

Oklahoma Statutes - Title 47. Motor Vehicles Page 630

5. On the front steering axle of a truck-tractor which has

tread depth measuring less than four-thirty-seconds (4/32) inch.

G. Every wheel on a vehicle shall not be cracked and shall be

securely fastened to the hub of the vehicle with all lug nuts

properly affixed.