What 393.209(a) means in plain language
FMCSR 393.209(a) is a vehicle maintenance violation that applies whenever a commercial motor vehicle has a wheel or rim that is cracked or broken. This includes damage visible during a roadside inspection that compromises the structural integrity of the wheel or rim assembly.
The regulation treats wheel and rim damage as a safety-critical defect because a failure at speed can lead to catastrophic loss of vehicle control. Unlike a flat tire, which is a temporary condition, a cracked or broken wheel creates an immediate hazard to the driver, cargo, and other road users.
When an inspector identifies this defect at roadside, the vehicle is eligible for an out-of-service order. That means you may not legally operate the vehicle until the wheel or rim is replaced or repaired by a qualified technician and re-inspected.
What our enforcement data actually shows
Across our 13 million+ inspection records, FMCSR 393.209(a) has generated 200 total citations since our database began tracking. In the last 12 months, we recorded 0 citations, and in the last 90 days, we also recorded 0 citations. This code ranks #1212 of 3,036 FMCSR codes by total enforcement volume.
However, when this code is cited, the consequences are steep. Our inspection records show a 76.0% out-of-service rate—meaning inspectors placed the vehicle out of service in 152 of 200 cases. This is substantially higher than the all-FMCSR average OOS rate of 31.4%, underscoring how seriously this defect is treated in enforcement.
Of the 200 all-time citations, 152 resulted in out-of-service orders and 48 did not. The high OOS rate reflects the safety-critical nature of the defect: if a wheel or rim is cracked or broken, it is very likely to be deemed unfit for operation.
Who gets cited most
Our inspection records do not currently include a state-level breakdown for this particular code in our dataset. However, our data shows that the top carriers cited under 393.209(a) include fleets such as Premier Dumpsters LLC (USDOT 3621623) with 2 citations, West Wind Logistics Inc (USDOT 1302563) with 2 citations, and Led Inc (USDOT 2519984) with 2 citations. These represent historical enforcement patterns and do not imply a systematic compliance deficiency across any single fleet.
The distribution across carriers is relatively flat: five carriers account for 2 citations each, and ten additional carriers account for 1 citation each. This suggests the violation occurs sporadically across the industry rather than concentrating in specific fleets.
How severe is this compared to similar codes
Wheel and rim integrity is part of the broader vehicle maintenance category. Comparing 393.209(a) to related codes in our database reveals the following:
393.9(a) — Inoperable required lamps has generated 660,737 citations with a 15.4% OOS rate. Lamp defects are far more frequent but much less likely to result in out-of-service action.
396.3(a)(1) — Inspection/repair/maintenance (general) has 236,919 citations and a 45.3% OOS rate. This catch-all maintenance code is cited more often and does result in OOS orders at a meaningful rate, but still lower than 393.209(a).
393.47E — Slack adjuster defective has 180,363 citations but a 0.0% OOS rate in our records. Slack adjusters are safety-critical to braking, yet inspectors rarely place vehicles out of service for this violation alone—often because it can be adjusted on the spot.
The 76.0% OOS rate for 393.209(a) places it among the most severe defects. A cracked or broken wheel cannot be field-repaired and requires immediate removal from service.
How to avoid it
Wheel and rim cracking or breaking is typically the result of impact damage, poor maintenance, or fatigue. Drivers and fleet maintenance personnel can reduce risk by following these steps:
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Perform a pre-trip wheel and rim inspection. Walk around your vehicle before departure. Look for any visible cracks, breaks, dents, or corrosion on all wheels and rims. Pay special attention to the inner sidewall of the rim, where stress cracks often originate.
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Check tire pressure and condition before each trip. Underinflated or overloaded tires accelerate rim stress and can contribute to cracking. Maintain tire pressure to specification and confirm load does not exceed GVWR.
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Avoid potholes and road debris when possible. Impacts at speed are the most common cause of sudden wheel or rim failure. Report road hazards to dispatch if you encounter them, and reduce speed in rough conditions.
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Schedule wheel and rim inspection at every service interval. Maintenance facilities should inspect rims for stress cracks, corrosion, and fatigue—particularly if your vehicle operates in heavy-duty use (dump trucks, flatbeds, or vehicles with high utilization).
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Replace wheels/rims showing early signs of damage. Do not operate on a wheel or rim with a visible crack, even if it is small. Cracks propagate under load and speed, and replacement is far cheaper than a roadside out-of-service order or accident.
Our inspection records show that Freightliner (15 citations), Peterbilt (14 citations), and Ford (7 citations) vehicles account for the largest share of 393.209(a) citations historically. This does not suggest a manufacturer defect, but rather reflects the prevalence of these models in commercial fleets and their heavy-duty use profiles. Regardless of vehicle make, diligent wheel and rim inspection is the primary control.