Preventing HGV Tyre Blowouts: Expert Tips from Our Technicians

Heat Is the Enemy: Understand Your Operating Conditions

The majority of catastrophic tyre blowouts are preceded by extended periods of heat build-up within the tyre casing. Heat accelerates the degradation of the rubber compounds and can cause delamination of the internal belt structure — the sudden release of this stored energy is what causes the characteristic explosive blowout. The main heat generators are under-inflation (causing excessive flexing), overloading (increasing the load on each tyre), and high sustained speeds (reducing cooling time between flexion cycles). Manage these three variables and you eliminate the primary cause of HGV tyre blowouts.

Never Drive on a Soft Tyre

This sounds obvious, but our technicians regularly attend incidents where drivers have continued driving after noticing abnormal handling suggesting a soft tyre. Driving as little as 50 miles on a significantly under-inflated tyre can destroy the internal structure of the casing beyond repair, and dramatically increases blowout risk. Modern TPMS (tyre pressure monitoring systems) fitted to HGVs provide an early warning system — but even without TPMS, diligent pre-journey pressure checks and mid-journey stops are the most reliable prevention method.

Inspect for Tread Separation and Liner Separation

Tread separation — where sections of the tread belt detach from the tyre casing — is a precursor to catastrophic blowout that can often be detected by careful visual inspection. Look for lifting or bubbling of the tread area, unusual temperature hotspots when checking tyres after a run (use an infrared thermometer), and any cracking or separation at the tread shoulder. Similarly, inner liner separation — visible as a slight bubble on the inner surface of the tyre when checked with a torch — indicates that the tyre's structural integrity is compromised.

Check the Spare and Check the Valve

Two components are frequently overlooked in HGV tyre maintenance routines: spare tyres and tyre valves. A spare tyre that has been sitting at low pressure for months is useless in an emergency and potentially dangerous when inflated rapidly to operating pressure. Check and maintain spare tyre pressure monthly. Tyre valves — particularly metal valve extensions used on twin-rear configurations — corrode and fail over time. A faulty valve is a common cause of slow pressure loss that goes undetected until it becomes critical. Replace valve caps after every pressure check, and replace complete valve assemblies at each tyre change.