Prevention FAQ — FMCSR 393.67: Tires – Other Defects

Inspectors are looking for physical tire damage that goes beyond tread depth or pressure — specifically exposed fabric, sidewall bulges, bumps, and cuts that compromise structural integrity. These are visible defects requiring only a walk-around and a light, so they're fast to cite.

Our inspection records show Texas dominates enforcement, accounting for 911 citations in the last 180 days alone, with a 10.1% OOS rate at that volume. Illinois is a critical outlier: only 8 citations in the same window, but a 62.5% OOS rate — meaning Illinois inspectors who find this defect are pulling trucks at more than six times the rate of their Texas counterparts. New Mexico shows a 100% OOS rate on its 1 recorded citation. Fleets routing through IL or NM should treat any visible tire damage as an automatic OOS risk and resolve it before the truck moves.

Your pre-trip form should require drivers to physically squat and inspect each tire sidewall — not just a rolling visual from a distance. Checklist line items to add:

• Sidewall integrity: Check both inboard and outboard sidewalls for bulges, bubbles, or bumps indicating internal belt separation.
• Cut depth and fabric exposure: Any cut exposing fabric or cord is an immediate no-go.
• Impact damage: Look for bruising or deformation consistent with pothole or curb strikes, which can cause internal damage not visible until a bulge forms later.
• Trailer tires: Our data shows UTIL trailers appear in 122 citations all-time — trailer tires are routinely under-inspected relative to drive and steer tires. Require the same sidewall inspection on every trailer axle.
• Post-shift inspection: Drivers returning a unit should document tire condition at drop so the next driver isn't inheriting damage they didn't cause.

Drivers should carry the current Driver Vehicle Inspection Report (DVIR) showing the tire inspection was completed and any prior defects were certified as repaired. If tires were replaced or repaired within the last maintenance cycle, a copy of the repair work order — or at minimum the unit number and shop date — strengthens the record.

Carriers must retain:

• Signed DVIRs for at least 3 months
• Maintenance records showing scheduled and unscheduled tire service
• Any pre-purchase or incoming inspection records for tires mounted on the unit

Our database shows 2,479 all-time citations for this code. Carriers that can demonstrate an active inspection and repair paper trail are far better positioned to challenge erroneous citations through DataQs. Gaps in DVIR chains are the first thing a safety auditor will look for if this code triggers a CSA review.

The co-occurrence data from our last 90 days of records reveals three systemic patterns:

1. 391.11B2-Z (English language proficiency) — 191 shared inspections: This is the most frequent co-occurring code by a wide margin. It indicates a significant portion of 393.67 citations are happening during inspections of cross-border operations. Drivers unfamiliar with U.S. pre-trip standards may not be trained to identify or report the specific tire defects this code covers.

2. 396.3A1 (Inspection, repair & maintenance) — 92 shared inspections: When general maintenance deficiencies appear alongside tire defects, the root cause is almost always a deferred or incomplete PM cycle. Tires are being mounted and run without a proper incoming inspection.

3. 393.9 (Inoperable required lamp) — 91 shared inspections: Lamp violations co-occurring with tire defects point to a driver inspection culture problem — if lights are missed on pre-trip, tires are being missed too. The issue isn't one defect; it's the quality of the walk-around overall.

A signed work order alone is insufficient. Build a return-to-service gate into your maintenance workflow:

1. Technician sign-off: The tech who performed the repair or mounted the replacement tire must document the specific axle/position and confirm no additional sidewall damage was found on adjacent tires during the swap.
2. Shop supervisor or safety manager review: For any 393.67-related repair, a second person should physically confirm the work before the truck is dispatched. This is especially critical given that 477 out of 2,479 all-time citations resulted in an OOS order — a truck returned to service prematurely can generate a repeat OOS citation on its next inspection.
3. Post-repair DVIR: The driver taking the unit out after repair must complete a fresh pre-trip and acknowledge the specific tire position was serviced.
4. Photograph the repaired/replaced tire: A timestamped photo tied to the unit number creates an auditable record that can support a DataQs challenge if the same position is cited again shortly after repair.

Run a structured post-event review within 48 hours of the citation:

1. Pull the inspection report: Identify the exact tire position cited. Check the last three DVIRs for that unit — did the driver note any tire concerns?
2. Check the DVIR chain: If no tire defect was reported pre-trip on the day of inspection, determine whether the damage was pre-existing and missed, or developed in-transit (e.g., a road strike).
3. Review the co-occurring violations: Our data shows 393.67 frequently appears alongside 393.95A (missing/defective fire extinguisher, 88 shared inspections) and 396.5B (fuel system leak, 63 shared inspections). If the citation came with either of these, you likely have a systemic pre-trip failure, not an isolated tire event.
4. Driver debrief: Walk through what the driver saw and when. Use it as a coaching moment on what bulges, fabric exposure, and cuts look like.
5. Fleet-wide check: Pull the same tire positions on similar units in the same lane or region for a targeted inspection.

FMCSR 393.67 carries a CSA severity weight of 6, which is a mid-to-upper tier score in the Vehicle Maintenance BASIC. Points are time-weighted, so recent citations hit harder than older ones.

For context on volume: this code ranks #490 out of 3,036 FMCSR codes by citation frequency — it's enforced at meaningful scale, not a rarely-used obscure code. Compare it to peer codes in the same category: 396.3(a)(1) has 236,919 citations and a 45.3% OOS rate; 393.9(a) has 660,737 citations. 393.67's all-time OOS rate of 19.2% sits below the all-FMCSR average of 31.4%, which means inspectors are generally writing this as a violation without pulling the truck — but an OOS here still happens in roughly 1 in 5 cases.

For carriers with multiple units receiving this citation, the compounding severity weight will push Vehicle Maintenance BASIC percentiles quickly. The top carrier in our records accumulated 63 citations under this code alone.

Our all-time citation data by vehicle make shows KW (Kenworth) leads with 432 citations, followed by FRHT (Freightliner) at 356 and PTRB (Peterbilt) at 139. These are the dominant Class 8 tractor platforms — the pattern reflects fleet size more than a design vulnerability, but it confirms that driver training for tractor operators on these platforms must explicitly cover tire sidewall inspection.

Training topics to close the gap:

• Sidewall anatomy: Show drivers what a healthy sidewall looks like versus early-stage bulge or belt separation. Use real images, not diagrams.
• Post-impact checks: Train drivers to inspect tires after any road strike, curb contact, or hard pothole — don't wait for the next pre-trip.
• Trailer tire awareness: UTIL trailers account for 122 citations — add a dedicated trailer tire walk-around module for drivers who frequently drop and hook.
• Cross-border operations training: Given the 191 co-inspections with 391.11B2-Z, ensure cross-border driver onboarding explicitly covers U.S. tire inspection standards and what to report on a DVIR.

A DataQs challenge is worth pursuing when you have documentation that directly contradicts the cited defect. Viable challenge scenarios:

• Pre-trip DVIR shows no defect + maintenance records show recent tire replacement at the cited position: This combination argues the defect either didn't exist at dispatch or was caused by a road event after the inspection.
• Inspector cited the wrong axle or position: If your post-inspection photos or tech notes show a different tire position than what was written on the inspection report, that's a factual error.
• Tread depth or pressure cited under 393.67 instead of the correct code: If the defect described doesn't match bulge, cut, or fabric exposure, the code may be misapplied.

A challenge is unlikely to succeed without a complete DVIR chain and a contemporaneous repair or replacement record. Note that Texas generates 911 citations in 180 days — high-volume enforcement environments mean inspectors are working quickly, and documentation errors do occur. Build your file before you dispute, not after.

The monthly trend over the last 12 months in our database shows a clear escalation: citations were 17 in April 2025, climbed through the fall, then spiked to 164 in December 2025 and 288 in March 2026 — the highest single month on record in this window. The last 90 days account for 608 of the 1,308 citations from the past year, meaning nearly half of all recent enforcement is compressed into the most recent quarter.

This trend has two practical implications for audit cadence:

1. Monthly fleet-wide tire sidewall inspections are the minimum given the sustained enforcement volume. Don't rely on quarterly PM intervals alone.
2. Increase frequency December through March: The data shows this is when citation rates peak — likely tied to cold-weather tire stress, road conditions, and increased border inspection activity. Run a targeted sidewall inspection on every unit before December 1 and again in February.

For carriers with Texas exposure specifically, given 911 citations in 180 days, a standing policy of tire sidewall documentation at every Texas terminal stop is justified by the numbers.