- No motor vehicle shall be operated on any tire that (1) has body ply or
belt material exposed through the tread or sidewall, (2) has any tread
or sidewall separation, (3) is flat or has an audible leak, or (4) has a
cut to the extent that the ply or belt material is exposed.
- Any tire on the front wheels of a bus, truck, or truck tractor shall
have a tread groove pattern depth of at least 4/32 of an inch when
measured at any point on a major tread groove. The measurements shall
not be made where tie bars, humps, or fillets are located.
- Except as provided in paragraph (b) of this section, tires shall
have a tread groove pattern depth of at least 2/32 of an inch when
measured in a major tread groove. The measurement shall not be made
where tie bars, humps or fillets are located.
- No bus shall be operated with regrooved, recapped or retreaded tires
on the front wheels.
- A regrooved tire with a load-carrying capacity equal to or greater
than 2,232 kg (4,920 pounds) shall not be used on the front wheels
of any truck or truck tractor.
- Tire loading restrictions (except on manufactured homes)
- Tire loading restrictions for manufactured homes
- Tire inflation pressure
- No motor vehicle shall be operated on a tire which
has a cold inflation pressure less than that specified for
the load being carried.
- If the inflation pressure of the tire has been increased
by heat because of the recent operation of the vehicle,
the cold inflation pressure shall be estimated by subtracting
the inflation buildup factor shown in Table 1 from the measured
inflation pressure. See FMCSR 393.75 for Table 1.