Before tackling a long drive, a family trip to the rural areas, or even just the daily commute, checking your tyre pressures is non-negotiable.
The recommended pressures for your tyres are specified in pounds per square inch (psi) or kilopascals (kPa), usually found on a sticker inside the driver’s door frame, the glove compartment, or in your vehicle’s owner’s manual. This is your bible for tyre pressure.
The Zimbabwean Road Hazard Warning
Never set your tyre inflation pressures below the manufacturer’s recommended level.
Under-inflation is dangerous everywhere, but it’s a serious threat on Zimbabwe’s roads. Why?
- Heat Build-up: Under-inflated tyres generate excessive heat. When combined with driving on hot tarmac over long distances (e.g., Harare to Bulawayo), this heat build-up can quickly lead to internal structural damage and tyre failure, including tread separation.
- Pothole Damage: Over-inflated tyres (above the maximum printed on the sidewall) are rigid and far more likely to suffer a catastrophic cut, puncture, or burst when you suddenly hit a hidden pothole or sharp road edge. You need the correct pressure to allow the tyre to flex and absorb impact without giving way.
Proper inflation is critical. It ensures your tyre can support the load (especially if you are carrying extra passengers or goods), maintain stability on poor surfaces, and handle emergency braking.
Safety and Cost Savings
- Longevity: Correctly inflated tyres wear evenly and last longer—a huge saving given the cost of imported tyres.
- Fuel Efficiency: Operating your vehicle with under-inflated tyres is wasting your precious fuel, making your drive needlessly expensive.
- Handling: Proper inflation means your car will steer and handle correctly, which is vital for avoiding unexpected hazards like livestock, pedestrians, or road debris.
Crucial Insight: It is impossible to accurately tell if a radial tyre is properly inflated just by looking at it! You must use a tyre pressure gauge. Keep one in your glove box—don’t rely on the often-inaccurate gauges at a service station.
How to Check Your Tyres in the Local Context
- Check Cold: Measure your tyre pressures (including your spare tyre!) when the tyres are cold—ideally first thing in the morning before the vehicle has been driven, or after it has been parked for a few hours.
- Don’t Bleed Hot Tyres: If you check the pressure after a long drive and it reads high, do not reduce (bleed) the pressure. This increase is normal due to heat. Adjust it only when the tyre has cooled down.
- Monthly Routine: Make checking your tyres a monthly routine and always do it before any long journey (e.g., weekend drives, festive season travel).
- The Damage is Permanent: Running a tyre under-inflated, even for a short distance, can cause irreparable internal damage. Adding air later won’t fix the weakness. If you notice repeated, unexplained pressure loss, get the tyre professionally inspected and repaired by a reputable dealer.
A Note on Nitrogen and TPMS
Whether you use standard compressed air (most common in Zimbabwe) or nitrogen (available at some high-end fitment centres), the rules for maintaining the correct pressure remain the same.
While newer, imported vehicles may have a Tyre Pressure Monitoring System (TPMS), do not solely rely on it. A TPMS might only warn you when pressure is dangerously low (25% under-inflated) and may not catch a slow, even leak across all tyres. Manual checking with a gauge is still the safest practice.
