Tire Inspection Checklist: What to Check Before You Drive

Before you drive, take a few minutes to inspect each tire and decide which of three actions fits the situation: continue normally, arrange service before travelling, or stop and request roadside help. A tire inspection checklist can reveal low pressure, tread wear, punctures, leaks, sidewall damage, or rubbing before a small problem becomes a roadside emergency.

This guide is for practical safety checks on personal vehicles. It is not a legal determination that a vehicle is roadworthy, and it does not replace a qualified inspection. Commercial drivers must also follow the applicable Ontario inspection requirements.

Quick summary

• Check all four tires for pressure loss, tread wear, punctures, bulges, cuts, exposed cords, and abnormal rubbing.
• Stop driving if a tire is flat, visibly leaking, badly damaged, bulging, or unable to hold pressure.
• For Ontario passenger vehicles, use the vehicle manufacturer's recommended cold tire pressure rather than guessing a number.
• Use four suitable winter tires in winter conditions. Do not mix different tire types on the same vehicle.
• When calling for help, provide your location, what happened, whether you are somewhere safe, and the tire size if available.

Tire inspection checklist before driving

Park on a reasonably level surface, switch off the vehicle, and inspect the tires in good light. Walk around the vehicle rather than checking only the tire that currently looks low. If your vehicle has a spare, inspect it as well, because a spare that has been forgotten for years may not be ready for use.

1. Check tire pressure and visible deflation

Compare the pressure in each tire with the vehicle manufacturer's recommended cold pressure. The correct figure is normally found on the vehicle information label or in the owner's manual, not on the maximum-pressure marking on the tire sidewall. Check when the tires are cold where possible, since driving heats the tires and changes the reading.

A tire that looks noticeably lower than the others may have a puncture, valve problem, bead leak, or other fault. Cold weather can also reduce tire pressure, so check pressure regularly during seasonal temperature changes. Ontario advises drivers to check tire wear and pressure regularly, particularly when preparing for winter driving. Ontario's winter-driving guidance provides the relevant seasonal advice.

Do not treat repeated inflation as a repair. If the same tire loses air again, arrange an assessment before relying on the vehicle for a longer trip.

2. Check tread wear and tread-wear indicators

Look across the tread, not just at the outer shoulder. Uneven wear can point to a maintenance or tire problem even when the centre tread appears acceptable. Check for bald areas, separated tread, embedded objects, and tread-wear indicators that are level with the surrounding tread.

Ontario's Ministry of Transportation advises replacing tires when the tread is less than 1.5 millimetres deep or when tread-wear indicators touch the road. Its guidance also identifies bumps, bulges, knots, exposed cords, and deep cuts as reasons to replace a tire. Read the MTO guidance on maintaining your vehicle for the official thresholds and warning signs.

A visual check is useful, but it cannot confirm every aspect of tire condition. If tread wear is uneven, the vehicle feels unstable, or the tire has suffered an impact, seek professional advice instead of relying only on a quick measurement.

3. Inspect sidewalls, shoulders, and the tread surface

Examine both the outward-facing sidewall and as much of the inner sidewall as you can see safely. Look for:

• Bulges, bubbles, bumps, or knots.
• Deep cuts, splitting, or cracking.
• Exposed cords or fabric.
• A puncture or object embedded in the tread.
• Scuffing or damage after contact with a curb, pothole, or road debris.
• Uneven wear on one edge or a band of wear around the tire.

A bulge usually indicates internal structural damage and is not a routine condition to monitor while continuing to drive. Exposed cords and deep sidewall cuts also require the vehicle to be assessed before it is moved. Do not assume that a plug, sealant, or extra air makes structurally damaged rubber safe.

4. Look for leaks, valve damage, and rubbing

Listen for hissing if it is safe to do so, and look for a visibly damaged valve stem, a loose valve-cap area, or a tire that has dropped noticeably since it was last checked. Do not place your hands near a suspected leak if the tire or wheel assembly appears damaged.

Check the space around each tire for fresh scuff marks or evidence that the tire is contacting the wheel well, suspension, bodywork, or another tire. Ontario's commercial-vehicle tire inspection criteria include flat or noticeably leaking tires, visible bumps or bulges, and contact with the vehicle or another tire. Those are useful warning signs for any driver, even though the formal rules apply to specified commercial vehicles.

When should you stop driving?

Use the following table as a stop-and-assess guide. Move the vehicle only if doing so is necessary to reach a safer position and the vehicle can be moved without creating additional risk. If you are in a live lane or an unsafe location, prioritize your personal safety and request emergency or roadside assistance as appropriate.

Finding	Why it matters	Safer next step
Flat or noticeably leaking tire	The tire may lose remaining support or damage the wheel.	Stop in a safe place and request assistance rather than continuing to drive.
Bulge, bubble, knot, or exposed cord	These signs can indicate structural failure.	Do not drive on the damaged tire. Arrange professional assessment or replacement.
Deep cut, separated tread, or major impact damage	Internal damage may not be visible from the outside.	Stop and seek professional help before travelling further.
Tire rubbing on the vehicle or another tire	Continued contact can rapidly damage the tire and vehicle.	Stop driving and have the cause assessed.
Tire repeatedly loses pressure	Inflation may temporarily hide a puncture or valve fault.	Arrange repair or replacement rather than repeatedly topping it up.
Tread-wear indicators touch the road	The tire has reached the replacement point identified in Ontario guidance.	Plan replacement before relying on the vehicle for normal travel.

When might a cautious trip to service be reasonable?

Not every concern has the same urgency. A tire with mild, even wear and no visible damage may be suitable for a planned inspection or seasonal service, provided its pressure is correct and it is not losing air. A small object in the tread still deserves professional assessment, because its location and the tire's condition determine whether repair is possible.

If you notice a bulge, exposed cord, serious cut, rapid pressure loss, or rubbing, do not turn a short trip into a gamble. Road conditions, traffic, distance, weather, vehicle load, and the tire's actual condition all affect the risk. When in doubt, stop safely and request roadside tire assistance.

Personal checks versus Ontario commercial-vehicle inspections

A walk-around check for a passenger vehicle is not the same as Ontario's regulated commercial-vehicle daily inspection. Private drivers can use this checklist to identify visible concerns, but commercial operators must use the inspection schedule that applies to their vehicle and operation.

What commercial drivers should know

Ontario requires a daily inspection for specified trucks, trailers, and converter dollies over the applicable weight threshold. The inspection must be completed within the permitted period before driving, and a daily inspection is valid for up to 24 hours. The precise requirements depend on the vehicle type and applicable schedule, so a general online checklist should not replace the official form or regulation.

Commercial tire checks can include tread condition, a flat or noticeably leaking tire, visible bumps or bulges, incompatible tire combinations on the same axle, and contact with the vehicle or another tire. Review Ontario's commercial-vehicle safety requirements and the applicable daily-inspection regulation for the formal framework.

If you operate a commercial vehicle, document the inspection as required and do not treat this article as a substitute for your employer's procedures, the applicable inspection schedule, or professional advice.

Seasonal and winter tire checks

Before winter, inspect pressure, tread, sidewalls, and the age and general condition of the tires you plan to use. Ontario recommends four winter tires rather than mixing different tire types on one vehicle. The three-peak mountain snowflake symbol identifies tires designed for severe snow conditions. Review Ontario's winter-driving recommendations when deciding what to check before the season begins.

After a seasonal changeover, check that the tires are correctly matched to the vehicle and that no tire has developed damage while stored. A changeover does not automatically resolve worn tread, a slow leak, a damaged valve, or an unsuitable tire. If a tire is questionable, ask for an assessment before depending on it in snow or cold weather.

Match the problem to the next step

Your inspection result should guide the type of help you request:

• Routine monitoring: Use this only when the tires show no visible damage, hold pressure, and have adequate tread. Continue regular checks.
• Planned mobile tire service: Consider this when you need an on-site tire repair assessment, tire replacement, or seasonal changeover and the vehicle is safely parked.
• Roadside tire assistance: Request help when the vehicle is stranded, a tire is flat or leaking, or damage makes driving unsafe.
• Professional inspection: Choose an assessment when the cause of a leak, uneven wear, rubbing, or vibration is unclear.

A checklist cannot determine whether a puncture is repairable or whether a tire should be replaced. That decision depends on the damage, its location, the tire's structure, and the vehicle's requirements. Do not promise yourself that a roadside repair will be possible before the tire has been assessed.

What to tell mobile tire service

When requesting help, gather the details below if it is safe to do so:

• Your exact location, such as a cross street, exit number, lot, or dropped pin.
• What the vehicle is doing, such as losing air, showing a warning, vibrating, or refusing to move.
• Whether the vehicle is safely parked or in a live lane.
• What happened, including a puncture, curb impact, pothole, seasonal changeover need, or gradual pressure loss.
• The tire size printed on the sidewall, if you can read it safely.
• The vehicle type and whether passengers, cargo, or a trailer are involved.

For drivers in Oshawa, Durham Region, and the eastern GTA, Jang Tire Services lists mobile tire repair, seasonal changeovers, new and used tires, battery help, and roadside assistance. Its contact information identifies the phone as the fastest way to explain where the vehicle is, what it is doing, and whether it is safe. Do not approach or inspect a vehicle in a live lane just to collect information.

Frequently asked questions

How can I tell if my tire tread is too worn?

Check for tread-wear indicators and measure tread when possible. Ontario guidance identifies less than 1.5 millimetres of tread or indicators touching the road as a replacement point. Uneven wear or visible damage also warrants assessment.

Can I drive with a tire bulge or exposed cord?

No. A bulge or exposed cord can indicate structural damage. Stop in a safe location and request professional assistance rather than driving to a shop on the damaged tire.

Should I use four winter tires or mix winter and all-season tires?

Ontario recommends four winter tires and advises against mixing different tire types on one vehicle. Check that the tires are suitable for the vehicle and in sound condition before installation.

Does this tire inspection checklist replace Ontario's commercial daily inspection?

No. Specified commercial vehicles must follow the applicable Ontario daily inspection requirements and schedule. This article is general educational guidance only.

What information should I provide when calling for roadside tire assistance?

Provide the vehicle's location, what happened, whether it is in a safe place or live lane, and the tire size from the sidewall if available.

Make the inspection part of your driving routine

A useful tire inspection checklist is more than a tread check. Look at pressure, tread, sidewalls, punctures, valve areas, leaks, and rubbing, then classify the result. No visible damage and stable pressure may support planned travel, while structural damage, active leaks, or a flat tire mean you should stop and arrange help.

Keep personal checks separate from Ontario's regulated commercial-vehicle inspections, and give extra attention to pressure and tire selection as the seasons change. If your vehicle is unsafe to move in Oshawa or nearby communities, Jang Tire Services provides mobile tire repair, seasonal changeovers, tire replacement options, and roadside assistance. Call 437-788-3377 with your location, vehicle condition, safety situation, and tire size if available.