If you're questioning it, you probably need new tires.
It's 1/16".
§ 175.80. Inspection procedure.
e.1.i
Quote:
(1) Inspect the tires and wheels and reject if one or more of the following apply:
(i) A tire has two adjacent treads with less than 2/32-inch tread remaining at any point—less than 4/32-inch tread on the front tires of the vehicles having a gross weight in excess of 10,000 pounds.
(ii) A tire is worn so that the tread wear indicators contact the road in any two adjacent grooves.
(iii) A part of ply or cord is exposed.
(iv) A tire has been repaired with a blow-out patch or boot.
(v) There is a bump, bulge or separation.
(vi) A tire is marked “not for highway use,” “for racing purposes only” or “unsafe for highway use,” or has a similar designation.
(vii) There are other conditions or markings reasonably believed to render the tire unsafe for highway use.
(viii) A tire has been regrooved or recut below the original tread design depth except special taxicab tires which are identified as having extra undertread rubber.
(ix) A tire’s tread extends beyond the outer edge of the wheel housing inclusive of fender flares.
(x) The tires used on the same axle are not the same size or type of construction—bias, belted, radial or snow.
(xi) The wheel nuts or bolts are missing, loose or have improper thread engagement.
(xii) The stud or bolt holes are worn out of round.
(xiii) Part of the wheel is bent, cracked, welded or damaged so as to affect safe operation of vehicle.
(xiv) The rear wheel does not track front wheel in straight ahead position as originally designed.
(xv) The wheel base on one side differs from the wheel base on the other side by more than 1 inch, unless the vehicle’s design specifications indicate different left and right wheel base dimensions.
(xvi) Studded tires are in use after April 15 and before November 1.
(xvii) Retreads are on the front axle of a taxi.
(xviii) The diameter of duals is not within 3/8-inch of each other.
(xix) An axle has missing tires or rims.
(xx) A tire makes contact with the body or chassis.
(xxi) Spacers over 1/4 inch in thickness are used to increase wheel track.
|
Otherwise, the tire should pass.