Tyres Are Usually the Second Largest Operating Cost
Across African dump truck operations, tyres typically represent 15 to 25 percent of total operating cost, second only to fuel and frequently exceeding operator cost. Despite this, tyre management is often the least disciplined function in the operation. Pressures are checked irregularly, damage is discovered late, repairs are deferred until a casing is destroyed, and procurement decisions are made on unit price rather than cost per hour. The result is a large and largely avoidable cost.
African operating conditions make tyre management more demanding than in most other regions. Ambient temperatures are high, haul roads are frequently laterite or unimproved, sharp blasted rock is common at loading faces and dump points, distances from supply are long, and road surfaces degrade rapidly during the rainy season. Each of these conditions attacks tyres through a different mechanism, and each requires a specific response.
Why African Conditions Destroy Tyres
Heat is the primary accelerant. Tyre operating temperature rises with ambient temperature, load, speed and deflection, and every sustained increase above the design operating range accelerates rubber degradation and weakens casing bonds. A tyre running at 70 degrees Celsius internal temperature has dramatically shorter life than the same tyre running at 50 degrees. Under-inflation increases deflection, which increases heat generation, which is why under-inflation and heat failure are so tightly linked.
Cut damage is the second major mechanism. Sharp blasted rock at loading faces, spillage on haul roads, and debris at dump points all produce cuts and penetrations. A small cut that is repaired promptly saves the casing; the same cut left unrepaired allows water and grit ingress that separates the casing plies and destroys a tyre that was 70 percent worn but still had substantial remaining life.
Impact damage is the third mechanism, caused by striking rocks, potholes, kerbs and loading-face debris at speed. Impact breaks casing cords, often invisibly from the outside, and produces a bulge or sudden catastrophic failure later. Impact damage is the most dangerous failure mode because it can occur without warning at speed under full load.
| Failure Mode | Primary Cause | Primary Prevention |
|---|---|---|
| Heat separation | Under-inflation, overload, sustained speed | Pressure discipline, load discipline |
| Cut and penetration | Sharp rock at face, spillage on haul road | Haul road maintenance, prompt repair |
| Impact break | Debris strikes, potholes at speed | Speed management, road grading |
| Irregular wear | Misalignment, worn suspension, pressure errors | Alignment checks, suspension maintenance |
| Sidewall damage | Kerb strikes, tight turning on rough ground | Driver training, site layout |
| Bead and rim damage | Poor mounting practice, corroded rims | Trained fitters, rim inspection |
Pressure Discipline: The Highest Return Activity
Of all tyre management activities, pressure discipline delivers the highest return per unit of effort, and it is the most commonly neglected. Correct pressure maintains the designed contact patch, limits deflection and heat generation, and ensures even tread wear. Incorrect pressure in either direction costs money: under-inflation causes shoulder wear, heat build-up and eventual casing failure, while over-inflation causes centre wear, reduced traction and increased susceptibility to impact and cut damage.
- Check cold: pressures must be checked before operation or at least three hours after parking, because heat raises reading substantially
- Check weekly minimum: daily for high-utilisation mining fleets; weekly is the absolute floor for construction fleets
- Use calibrated gauges: uncalibrated gauges drift; a gauge reading 10 percent low will systematically under-inflate an entire fleet
- Cap and core maintenance: leaking valve cores and missing caps are a silent cause of chronic under-inflation
- Adjust for load: pressures appropriate to empty running differ from loaded haulage; follow the manufacturer's load and pressure table
- Record trends: a tyre losing pressure repeatedly has a defect that must be found, not topped up indefinitely
Haul Road Management Is Tyre Management
The most effective long-term lever on tyre cost is not tyre specification but haul road condition. Smooth, compacted, well-drained and well-graded roads reduce impact damage, eliminate the pothole strikes that break casings, minimise rolling resistance and heat generation, and keep spillage from becoming embedded cutting hazards. Contractors who invest in graders and water trucks consistently report lower tyre cost per hour than those who do not, and the effect is largest during the rainy season.
Road maintenance priorities in order of impact: remove spillage promptly, grade to eliminate corrugation and potholes, maintain cross-fall and drainage so water does not pond, control speed through dust suppression and enforcement, and keep loading faces clean so that rock does not lie where trucks must drive over it.
Repair, Retread and Replacement Decisions
A structured repair policy converts damage events from total losses into managed costs. The governing principle is that repairs must be performed early and by trained personnel using proper materials. A cut repaired within days retains the casing; the same cut driven on for weeks usually does not.
Retreading is well established for truck tyres and delivers substantial cost savings where casing quality is preserved. Retreading is only viable on casings that have been properly maintained, which means pressure discipline and prompt repair are the preconditions for a retread programme, not alternatives to it. Fleets that skip pressure management typically have no retreadable casings and therefore pay full replacement price throughout their life.
Replacement decisions should be driven by cost per hour, not unit price. A premium tyre costing 25 percent more but delivering 40 percent more hours is the cheaper tyre. Track tyre life by position, by route and by truck, because the data will show where the money is going and which specification actually performs in your conditions.
Mounting and fitting practice deserves explicit attention because poor fitting causes both immediate safety incidents and long-term casing damage. Tyres should be mounted by trained fitters using correct equipment, with rims inspected for corrosion and damage before fitting, beads lubricated correctly, and inflation performed inside a safety cage. Damaged or corroded rims cause bead leaks and, in the worst case, violent separation during inflation.
Procurement and Inventory for Remote Operations
African operations frequently work far from tyre supply, which makes inventory planning a availability issue rather than a purchasing convenience. Remote sites should hold a minimum stock sized to the fleet and to the resupply lead time, typically not less than one full spare per truck plus a buffer of the most failure-prone sizes. Sizing should account for seasonal access: sites that become difficult to reach during the rainy season should build stock before the season begins.
Standardisation reduces inventory cost sharply. Fleets that run a single tyre size and specification across all positions and all trucks carry a smaller stock, achieve better prices through volume, and avoid the situation where the right tyre is on hand but is the wrong size for the truck that is down.
Conclusion
Tyre cost in African dump truck operations is large, but it is also unusually controllable. The highest-return actions are unglamorous: disciplined cold pressure checks with calibrated gauges, prompt repair of cuts, haul road maintenance that eliminates impact hazards, load and speed discipline, and inventory sized to resupply reality rather than to convenience. Operators who implement all five consistently reduce tyre cost per hour by 20 to 35 percent without changing tyre brand or specification.
Shaanxi Fenghan Trading supplies SAGMOTO dump trucks specified for African conditions and advises operators on tyre specification, pressure regimes and inventory planning. Contact us to review your fleet's tyre cost position.