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Historical textIn force on Oct. 1, 2000Source: annual CFR editions 1998–2000

§ 393.75 Tires.

Wording in the annual edition revised as of Oct. 1, 1998, superseded by the 2001 annual edition.

govinfo, 2000 edition ↗
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2000 edition's wording. An amendment that took effect between Oct. 1, 2000 and Oct. 1, 2000 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.
49 CFR § 393.75 — Tires.. Text in force on October 1, 2000. This wording effective October 1, 1998 to October 1, 2001. Source: govinfo, 2000 edition, https://www.govinfo.gov/app/details/CFR-2000-title49-vol4/CFR-2000-title49-vol4-sec393-75. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.75?asof=2000-10-01, on October 26, 2026. Unofficial compilation; verify against the official source.

(a) 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.

(b) 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.

(c) 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.

(d) No bus shall be operated with regrooved, recapped or retreaded tires on the front wheels.

(e) No truck or truck tractor shall be operated with regrooved tires on the front wheels which have a load carrying capacity equal to or greater than that of 8.25-20 8 ply-rating tires.

(f) Tire loading restrictions. With the exception of manufactured homes, no motor vehicle shall be operated with tires that carry a weight greater than that marked on the sidewall of the tire or, in the absence of such a marking, a weight greater than that specified for the tires in any of the publications of any of the organizations listed in Federal Motor Vehicle Safety Standard No. 119 (49 CFR 571.119, S5.1(b)) unless:

(1) The vehicle is being operated under the terms of a special permit issued by the State; and

(2) The vehicle is being operated at a reduced speed to compensate for the tire loading in excess of the manufacturer's rated capacity for the tire. In no case shall the speed exceed 80 km/hr (50 mph).

(g) Tire loading restrictions for manufactured homes. Effective November 16, 1998, tires used for the transportation of manufactured homes (i.e., tires marked or labeled 7-14.5MH and 8-14.5MH) may be loaded up to 18 percent over the load rating marked on the sidewall of the tire or, in the absence of such a marking, 18 percent over the load rating specified in any of the publications of any of the organizations listed in FMVSS No. 119 (49 CFR 571.119, S5.1(b)). Manufactured homes which are labeled (24 CFR 3282.7(r)) on or after November 16, 1998 shall comply with this section. Manufactured homes transported on tires overloaded by 9 percent or more must not be operated at speeds exceeding 80 km/hr (50 mph). This provision will expire November 20, 2000 unless extended by mutual consent of the FHWA and the Department of Housing and Urban Development after review of appropriate tests or other data submitted by the industry or other interested parties.

(h) Tire inflation pressure. (1) No motor vehicle shall be operated on a tire which has a cold inflation pressure less than that specified for the load being carried.

(2) 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.

Table 1.—Inflation Pressure Measurement Correction for Heat
Average speed of vehiclein the previous hour Minimum inflation pressure buildupTires with 1,814 kg (4,000 lbs.) maximum load rating or lessTires with over 1,814 kg (4,000 lbs.) load rating
66-88.5 km/hr (41-55 mph)34.5 kPa (5 psi)103.4 kPa (15 psi).

[34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998]

Amendment history

9 distinct wordings on file since Oct. 1, 1996
  1. March 23, 2026 → presenteCFR, day-precisediff vs. previous
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998; 65 FR 70220, Nov. 21, 2000; 66 FR 67694, Dec. 31, 2001; 70 FR 48054, Aug. 15, 2005; 81 FR 47731, July 22, 2016; 91 FR 7887, Feb. 19, 2026]
  2. Feb. 19, 2026 → March 23, 2026eCFR, day-precisediff vs. previous
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998; 65 FR 70220, Nov. 21, 2000; 66 FR 67694, Dec. 31, 2001; 70 FR 48054, Aug. 15, 2005; 81 FR 47731, July 22, 2016]
  3. Oct. 1, 2016 → Feb. 19, 2026annual edition 2016diff vs. previous
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998; 65 FR 70220, Nov. 21, 2000; 66 FR 67694, Dec. 31, 2001; 70 FR 48054, Aug. 15, 2005; 81 FR 47731, July 22, 2016]
  4. Oct. 1, 2009 → Oct. 1, 2016annual editions 2009–2015diff vs. previous
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998; 65 FR 70220, Nov. 21, 2000; 66 FR 67694, Dec. 31, 2001; 70 FR 48054, Aug. 15, 2005]
  5. Oct. 1, 2005 → Oct. 1, 2009annual editions 2005–2008diff vs. previous
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998; 65 FR 70220, Nov. 21, 2000; 66 FR 67694, Dec. 31, 2001; 70 FR 48054, Aug. 15, 2005]
  6. Oct. 1, 2002 → Oct. 1, 2005annual editions 2002–2004diff vs. previous
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998; 65 FR 70220, Nov. 21, 2000; 66 FR 67694, Dec. 31, 2001]
  7. Oct. 1, 2001 → Oct. 1, 2002annual edition 2001diff vs. previous
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998; 65 FR 70220, Nov. 21, 2000]
  8. Oct. 1, 1998 → Oct. 1, 2001annual editions 1998–2000diff vs. previousviewing
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988; 63 FR 8339, Feb. 18, 1998]
  9. Oct. 1, 1996 → Oct. 1, 1998annual edition 1996
    [34 FR 9344, June 13, 1969, as amended at 40 FR 44557, Sept. 29, 1975; 41 FR 36657, Aug. 31, 1976; 44 FR 25455, May 1, 1979; 44 FR 47938, Aug. 16, 1979; 53 FR 18057, May 19, 1988; 53 FR 49401, Dec. 7, 1988]

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.