One tire keeps losing pressure; what should I document before a tire appointment?
Quick answer
Before your appointment, record the tire’s pressure, date and time, whether the tire was cold, the weather or temperature if known, and any recent tire work or relevant changes you noticed. Use the same gauge if practical, and compare readings with the vehicle manufacturer’s recommended pressure. Michelin advises checking cold tires and comparing gauge readings with that recommendation [S1]. If pressure keeps dropping, contact a tire professional for advice; a log cannot establish whether the vehicle is safe to drive.
The question, the details, the next step.
One tire keeps losing pressure, and I want to arrive at the appointment with useful information. What should I write down?
Make a short, dated log rather than relying on memory. For each check, note the tire location, pressure reading, date and time, and whether the tire was cold. Michelin recommends checking pressure when tires are cold and comparing the gauge reading with the vehicle manufacturer’s recommendation [S1]. Record that recommendation from your vehicle information or owner’s manual so the tire shop can see the comparison.
Also note the gauge you used, if you know it, and any recent tire service, tire changes, or other relevant events. These extra details are useful recordkeeping, not a leak test or a diagnosis.
What does “cold” mean for the log? I may not know the exact temperature outside.
You do not need to guess a precise temperature. Write a plain description of the conditions when you checked, such as “before driving,” “after a short trip,” or “parked for several hours.” Michelin’s guidance supports recording whether the tire was cold, but it does not prescribe a particular log format or tell you how to estimate temperature [S1].
If you do know the approximate outdoor temperature or weather, add it as context and label it approximate. Keep observations separate from conclusions: write “pressure read lower than last check,” rather than deciding what caused the change.
Can you give me a copyable log? I have a reading from today and an older one, but I’m not sure they were taken under the same conditions.
Yes. Preserve the readings, but mark what you do not know instead of filling gaps with guesses. For example:
Pressure-loss log — tire appointment Vehicle: [make/model or description] Tire location: [front/rear, left/right] Vehicle-recommended pressure: [value and where you found it] Gauge: [type or “unknown”]
Check 1 Date/time: [date and time] Reading: [pressure and unit shown on gauge] Tire cold?: [yes / no / unsure; brief context] Weather or temperature: [optional; approximate if estimated] Notes: [what you observed; no assumed cause]
Check 2 Date/time: [date and time] Reading: [pressure and unit shown on gauge] Tire cold?: [yes / no / unsure; brief context] Weather or temperature: [optional; approximate if estimated] Notes: [what you observed; no assumed cause]
Previous tire work or relevant events: [date, work described, or “unknown”] Questions for the tire professional: [What should I do if pressure drops again?]
If the two readings were taken under different conditions, say so clearly. The readings can still provide a timeline, but avoid presenting them as a like-for-like comparison.
Should I keep checking it and driving around to collect more readings before the appointment?
Do not use the log as a reason to keep driving or to decide that a tire is safe. The supplied Michelin page does not establish a safe-driving rule for a tire that keeps losing pressure; it recommends professional tire service rather than attempting a repair [S1]. Contact a tire professional and ask what to do about the current pressure and whether the vehicle should be moved or serviced where it is. Share the readings you already have, including uncertainty about how they were taken.
A practical checklist
Write down each pressure reading with its date, time, and displayed unit.
Record whether the tire was cold, and describe the checking conditions if unsure.
Note the vehicle-recommended pressure and where you found it.
Add the gauge used, if known, and optional weather or approximate temperature.
List previous tire work and relevant events without guessing at a cause.
Ask a tire professional what to do if pressure drops before the appointment.
A few more useful answers
Do I need exact weather data?
No. Add weather or approximate temperature only if you know it, and label estimates. The essential record is the reading, time, and whether the tire was cold.
What if I do not know the recommended pressure?
Mark it as unknown rather than guessing, and ask the tire professional to help identify the vehicle manufacturer’s recommendation. Michelin advises comparing the gauge reading with that recommendation [S1].
Can this log tell me what is causing the pressure loss?
No. It organizes observations for the appointment; it does not diagnose the cause or establish whether the vehicle is safe to drive. The supplied source does not prescribe a leak-history log.
Sources
References used for this guide.
- [S1] How to Properly Inflate Your Car Tires | Michelin USA michelinman.com · Checked