Solid Forklift Tyre Failures: Every Type, Cause and Prevention

Why Solid Tyres Fail — The Core Principle

Most solid forklift tyre failures have one root cause: a mismatch between the tyre and its operating environment. The wrong compound grade on the wrong surface, the wrong tyre size for the load, or the wrong mounting procedure. Understanding each failure mode — what it looks like, why it happens, and how to prevent it — is the most practical way to reduce tyre costs and eliminate unplanned downtime.

1. Chunking and Tearing

What it looks like

Pieces of rubber are missing from the tyre tread surface — ranging from small chips to large chunks. The missing areas have a torn or jagged appearance. The tyre tread is visibly uneven.

Causes

• Wrong compound for the surface: Standard indoor compound tyres used on rough outdoor yards, gravel, dock plates with sharp raised edges, or floors with metal swarf. The compound lacks the tensile strength and cut resistance for these surfaces.
• Sharp floor transitions: Dock leveller lips, expansion joints, grating, or metal edge strips at loading bays create point loads that tear the tread.
• Overloading: Operating above the tyre's rated load capacity increases ground contact stress beyond the compound's design limits.
• Excessive speed over obstacles: High-speed impact with floor debris, potholes, or raised edges concentrates force in a small area, tearing the compound.
• Worn past the 60J line: Once inner core compound is exposed, it chunks rapidly as it is not formulated for surface contact.

Prevention

• Specify an outdoor or heavy-compound grade (Obsidian or Heavy Duty) for environments with sharp surfaces or debris
• Install floor ramps or bevels at dock transitions to reduce point impact on tyres
• Enforce load limits — never exceed the tyre's rated capacity
• Replace tyres before they reach the 60J line

2. Sidewall and Surface Cracking

What it looks like

Fine cracks or a network of cracks (crazing) visible on the tyre sidewall or tread surface. Cracks may be shallow and cosmetic, or deep enough to penetrate into the tyre body.

Causes

• Ozone and UV degradation: Rubber oxidises over time — outdoor storage or operation accelerates this. Ozone attacks the polymer chains in rubber, causing surface cracking.
• Age: Even unused solid tyres degrade if stored improperly. Tyres should be stored away from UV, ozone sources (electric motors, welding equipment), and in a cool, dark environment.
• Wrong compound for cold environment: Standard rubber compound stiffens and becomes brittle in cold storage temperatures. Cold-store applications require a compound formulated to remain flexible at low temperatures (0°C to −20°C).
• Chemical exposure: Contact with solvents, fuels, or industrial chemicals degrades rubber compound.
• Overloading combined with age: Mechanical stress on already-degraded rubber accelerates cracking.

Prevention

• Store tyres indoors, away from UV and ozone sources, and use within the manufacturer's recommended shelf life
• Specify cold-temperature compound for cold storage and pharma warehouse applications
• Replace tyres with deep sidewall cracks (more than 2mm depth or penetrating the tread) immediately — do not assess by tread depth alone
• Shallow surface crazing on a tyre still above the 60J line is cosmetic; monitor but does not require immediate replacement

3. Flat Spotting

What it looks like

The tyre has a visibly flattened section on the tread. The forklift vibrates rhythmically — once per wheel revolution — even at low speed. Operators describe a “thumping” or “bouncing” sensation.

Causes

• Extended static parking: A forklift parked stationary for many hours — especially overnight or over a weekend — with weight on the tyres causes the rubber to take a permanent set in the contact patch area. Cold temperatures worsen this effect.
• Parking with a load on the forks: Carrying a load while parked dramatically increases contact pressure and accelerates flat spot formation.
• Hard braking on smooth floors: Aggressive braking scuffs or flat-grinds the tread contact patch on smooth epoxy or polished concrete floors.
• Under-specification tyre: A tyre used at the upper limit of its load rating is more susceptible to flat spotting under load.

Prevention

• Lower the forks and remove any load before parking the forklift
• If possible, move the forklift a short distance after extended parking to redistribute the contact point
• In cold storage environments, allow tyres to warm for 10–15 minutes at low speed before high-cycle operation — cold compound is more prone to taking a set
• Avoid aggressive braking on smooth floors; train operators on gradual stopping

4. Delamination (Layer Separation)

What it looks like

Visible bubbling, lifting, or separation between tyre layers — typically visible at the sidewall edge or as a raised section on the tread. In advanced cases, a layer of tread rubber peels away from the underlying compound. The tyre may feel or sound different under load.

Causes

• Heat buildup: Operating at excessive speed — above 15–25 km/h sustained — generates internal heat that breaks down the adhesive bond between compound layers. This is the most common cause.
• Operating past the 60J line: Once inner core compound is exposed, it heats unevenly under load, accelerating layer separation.
• Incorrect pressing: A tyre pressed onto the wrong bore dimension — too small causes compression stress; too large causes insufficient interference fit — creates mechanical stress at layer boundaries.
• Substandard compound bonding: In poorly manufactured tyres, insufficient vulcanisation between layers creates weak interlayer bonds that separate under operational stress.

Prevention

• Enforce speed limits — solid resilient tyres are not designed for sustained high-speed travel; operate within the tyre's rated speed
• Replace tyres before reaching the 60J line
• Ensure tyres are pressed by a trained technician using the correct bore dimension for the specific rim
• Source tyres from manufacturers with documented quality control (ISO 9001 certification, batch traceability)

A delaminating tyre must be replaced immediately and the forklift taken out of service. There is no safe way to continue operating on a tyre with visible layer separation.

5. Uneven or Eccentric Wear

What it looks like

The tyre shows significantly more wear on one side than the other (edge wear), or patches of heavy wear alternating with less-worn sections (cupping or eccentric wear). One tyre on an axle may show more wear than the other.

Causes

• Wheel misalignment: Incorrect toe-in or camber setting causes the tyre to track at an angle, wearing one edge disproportionately.
• Overloaded steer axle: The rear steer tyres on a counterbalance forklift carry the counterweight — if the load is too heavy for the tyre rating, excessive pressure on one contact patch causes accelerated localised wear.
• Wrong tyre size for the rim: A tyre fitted to a rim that is slightly too large or too small in outer diameter creates uneven ground contact.
• Floor camber: Operating continuously on a sloped or cambered floor surface causes one side of the tyre to carry more load consistently.
• Operator habit: Consistently turning in one direction, or always loading from the same side, creates asymmetric wear patterns over time.

Prevention

• Check and correct wheel alignment at every tyre change — do not assume alignment is unchanged from the previous set
• Rotate tyres between axle positions where the forklift design allows (drive and steer tyres are usually different sizes — check OEM guidance)
• Use the correct tyre size specified by the forklift OEM for that axle position
• Address floor drainage and camber where possible in new warehouse designs

6. Rim Slippage (Tyre Spinning on the Rim)

What it looks like

The tyre rotates independently of the rim — the rim turns inside the stationary or slower-moving tyre. Chalk marks or paint reference points placed on tyre and rim confirm the two are moving at different rates. The tyre may feel “loose” and the forklift may pull to one side under acceleration or braking.

Causes

• Tyre worn past the 60J line: The tyre's outer diameter has reduced to the point where the interference fit no longer provides sufficient grip on the rim. This is the most common cause.
• Incorrect bore dimension during pressing: If the tyre was pressed onto a rim with insufficient interference — bore dimension too close to the rim OD — the retention force was never adequate.
• Oil or grease contamination on the rim: Lubrication on the rim bore reduces the friction component of the interference fit. Some lubrication is required for pressing, but excess must be removed before the tyre seats fully.
• Mechanical damage to the rim bore: Scoring or wear on the rim OD reduces the effective interference.

Prevention

• Replace tyres before they reach the 60J wear limit
• Always use the correct bore dimension for the specific rim — verify with the tyre manufacturer if unsure
• Use only the specified amount of pressing lubricant and allow it to displace fully before finalising the press position
• Inspect rims for wear and scoring at every tyre change; replace damaged rims

7. Heat Cracking and Overheating

What it looks like

Cracks forming across the tread surface, often in the base of tread grooves. The rubber may appear glossy or hardened in the contact patch area. The tyre may smell of burning rubber during operation.

Causes

• Sustained high speed: Solid rubber generates heat internally through flexion during operation. At sustained speeds above the tyre's rated maximum, heat accumulates faster than it can dissipate, degrading the rubber compound.
• Excessive operating cycles without rest: Forklifts operating continuously for very long shifts without rest periods trap heat in the tyre.
• Overloading at speed: Combining excess load with high speed multiplies heat generation.
• Operating in hot environments: Foundries, hot-rolling mills, or outdoor summer environments in India (ambient temperatures above 40°C) reduce the tyre's ability to dissipate heat.

Prevention

• Enforce speed limits — maximum recommended speed for most solid resilient tyres is 15–25 km/h; consult the tyre datasheet
• Specify a high-temperature rated compound grade for hot environments
• Allow forklifts rest periods in high-duty-cycle operations
• Select a higher tyre grade (Heavy Duty or Premium) for high-speed or high-duty applications — they use compounds with better heat dissipation characteristics

Quick Reference: Failure Summary

Frequently Asked Questions