Tire Inspection
Roadside Inspection Tire Issues
Roadside tire issues usually involve visible or measurable conditions: tread, inflation, damage, loading, and obvious unsafe condition. The exact inspection result depends on the inspector, the condition, and the current rules.
The useful work happens before the stop: control the tire conditions that are visible, measurable, and fixable.
Common issue areas — conservative reference
| Condition | Federal reference | Notes |
|---|---|---|
| Tread below 4/32 inch — steer axle tires | 49 CFR 393.75(b) | Applies to commercial motor vehicles; measure with gauge |
| Tread below 2/32 inch — drive and trailer tires | 49 CFR 393.75(c) | Minimum for non-steer positions; many fleets pull earlier |
| Any tire with exposed cord or belt material | 49 CFR 393.75(a) | Immediate removal trigger regardless of axle position |
| Flat or severely underinflated tire | 49 CFR 393.75(a)(1) | A tire that cannot support the load; not just low by a few PSI |
| Sidewall bulge or separation | 49 CFR 393.75(a)(3) | Visible structural failure; remove from service immediately |
| Prohibited tire type in position | 49 CFR 393.75(f) | Includes restrictions on retreads in certain positions by vehicle type |
| Tire carrying load beyond rated capacity | 49 CFR 393.75(a)(5) | Requires knowing the tire's load rating and the actual axle weight |
Before the stop vs at the stop
| Situation | Before the stop — what you can control | At the stop — what to do |
|---|---|---|
| Known tread issue | Remove the tire before dispatch; use tread gauge at pre-trip | Follow inspector direction; do not dispute thresholds at roadside |
| Inside dual condition unknown | Check inside dual with light and gauge before dispatch | Inspector may check inside tires; no opportunity to correct at roadside |
| Tire showing pressure loss history | Investigate cause before dispatch; do not just air up and go | A visibly underinflated tire at a stop may result in out-of-service order |
| Uncertain sidewall damage | Get professional inspection before dispatching | If condition looks borderline to inspector, decision is theirs to make |
What to keep in the maintenance record
The best roadside defense is not a long explanation after the defect is found; it is a clean record that shows the tire was checked before dispatch and corrected when needed. Keep the record factual: date, unit, position, tread depth, pressure reading, visible damage note, and repair or removal action.
Avoid vague entries such as "tires ok" when a specific issue was checked. If an inside dual was measured, say so. If a tire was removed because a sidewall bulge was suspected, record that decision rather than only noting the replacement.
Gray-area conditions
Some tire conditions are not easy to classify from a distance: small cuts, repaired punctures, weather checking, shoulder scuff, or a pressure reading that is low but not flat. Treat gray-area conditions as maintenance decisions before dispatch, not roadside debates. When the consequence of being wrong is a violation, tow delay, or tire failure, a conservative pull point is usually cheaper than arguing later.
Compliance caution
This site does not interpret enforcement decisions or predict inspection outcomes. The federal references above are starting points. CVSA out-of-service criteria define specific enforcement thresholds used at roadside inspections and are updated annually — always consult the current version through your carrier compliance process or the CVSA directly. State laws may add requirements beyond federal minimums.
Step-by-Step Checklist
- Fix known tire defects before dispatch — do not defer visible problems.
- Keep tire inspection records current; they may be reviewed at a stop.
- Use a repeatable pre-trip process including inside duals and valve condition.
- Escalate uncertain sidewall damage or repeated pressure loss to maintenance before dispatch.
- Know your fleet's pull points — they should equal or exceed federal minimums.
FAQ
What tire conditions commonly result in out-of-service orders?
Conditions commonly cited during inspections include insufficient tread depth (below 4/32 inch on steer axles and 2/32 inch on other positions per 49 CFR 393.75), visible cord or belt material, flat or severely underinflated tires, sidewall bulges or separations, and tires visibly carrying load beyond their rated capacity. Current CVSA North American Standard out-of-service criteria define the specific enforcement thresholds used during roadside inspections.
Can a truck be cited during a roadside inspection for tire age alone?
Tire date code is not listed as an out-of-service criterion in current CVSA North American Standard inspection procedures. Enforcement focuses on visible condition defects. However, specific states or operating conditions may address tire age requirements separately. Check applicable state rules and fleet requirements for your operations.
What should I do if a tire defect is found during a roadside inspection?
Follow the inspector's direction and your carrier's compliance procedures. Do not attempt to dispute a defect by arguing about thresholds at the roadside — address defects before dispatch. Fix the defect before moving the vehicle if the tire has been placed out of service. Document the defect and the correction in your maintenance records. Contact your carrier's safety department for guidance on any citation.
Source Notes
- Government 49 CFR 393.75 - Tires
- Government FMCSA Motor Carrier Safety Planner: Tires (393.75)
- Industry CVSA North American Standard Out-of-Service Criteria overview
- Site note TruckTireGuide.com editorial notes
Editorial Review
TruckTireGuide.com editorial team
Maintained by an independent editor with fleet tire-program experience in regional Class 8 operations, supported by transportation regulatory research and commercial vehicle technical writing.
Pages are checked against public regulations, manufacturer resources, industry references, and conservative field practice. The site does not approve tires for service or replace qualified inspection.