Steel Cord vs Fabric Cord Rubber Tracks: What’s the Real Difference? 

Cut a rubber track open across its width, and you’ll find a layer of reinforcing material embedded in the rubber body. It’s not visible from the outside; it doesn’t appear in photos, and most product listings don’t mention it. But that reinforcement is the structural backbone of the track it carries the machine’s load, resists elongation, and determines how the track behaves under shock loading. 

There are two fundamentally different reinforcement approaches: continuously wound high-tensile steel cord, and woven fabric (typically nylon or polyester). The difference between them is real, measurable, and matters for how long the track lasts and what it can handle. 

What the Reinforcement Actually Does 

Rubber on its own is elastic and resilient, but it lacks the tensile strength to carry a multi-tonne machine load. The reinforcement layer takes that load. It also resists the elongation that would otherwise cause the track to stretch, changing the effective pitch and causing sprocket misengagement. And it holds the track body together under the repeated flex cycling of running around the drive sprocket and idler, which happens hundreds of thousands of times over a track’s working life. 

The bond between the reinforcement and the surrounding rubber compound is critical. If the cord layer delaminates from the rubber matrix which can happen from a manufacturing quality issue, incorrect adhesion chemistry, or cord corrosion, the track begins to fail from the inside. This is why compound formulation and cord surface treatment are as important as the cord’s raw strength. 

Steel Cord 

High-tensile steel cord starts as fine-drawn wire, typically 0.15 to 0.30mm in diameter. Individual wires are twisted into strands, strands are combined into cords, and the cord is continuously wound in a spiral pattern across the full width of the track during manufacture. This continuous winding is significant: rather than individual discrete cords that could shift or gap, the continuous wound construction creates a unified reinforcing layer with no weak zones at edges or joints. 

The tensile strength of high-tensile steel cord is in the range of 1,800 to 2,500 MPa far beyond what polymer fibres can achieve at equivalent cross-sections. This means less material is needed to carry the load, which allows a slimmer reinforcement layer without sacrificing strength. A slimmer layer means a more flexible track body, which reduces stress at the bend points around sprocket and idler. 

Flex fatigue in steel cord tracks depends on wire diameter. Fine-wire cords in the 0.15 to 0.20mm range can sustain hundreds of thousands of flex cycles without wire fatigue failure, the wires are thin enough that bending stays within their elastic range. Coarser wire improves manufacturability but reduces flex fatigue performance. Premium track manufacturers choose wire diameter based on the sprocket diameter and the expected flex cycle rate, rather than just on manufacturing convenience. 

The weakness of steel cord is corrosion. If the rubber body is cut or abraded deep enough to reach the cord layer, water and oxygen will begin attacking the steel. Rust reduces wire cross-section, which reduces tensile strength and initiates fatigue cracks at the corrosion pits. Premium cord is brass-plated, which improves the rubber adhesion bond and provides an initial corrosion barrier, but once the rubber is breached, moisture will eventually reach the cord. 

The practical implication: inspect steel cord tracks regularly for any damage that penetrates to the cord layer. Exposed, rusting cord is a track that’s counting down its remaining life. 

Fabric Cord 

Fabric reinforcement uses woven or knitted nylon or polyester fibres, treated with an adhesion dip and embedded in the track body. It’s a simpler manufacturing process than continuous wound steel cord, which contributes to lower production cost. 

The tensile strength of high-tenacity polymer fibres runs from roughly 700 to 1,000 MPa substantially below steel cord. To carry the same load, more material is required, or the track must be thicker. This has knock-on effects on the track’s weight, flexibility at low temperatures, and outer dimensions. 

Where fabric reinforcement genuinely excels is flex fatigue and corrosion resistance. Polymer fibres don’t work-harden and crack the way metal fatigue causes metal to fail they can flex repeatedly at tight radii without accumulating damage in the same way steel does. On machines with very small sprocket diameters, or in applications with very high flex cycle rates, fabric can match or exceed steel cord on this metric. 

And fabric doesn’t rust. In marine environments, coastal sites, or applications where the track body is expected to take damage and water ingress is a real concern, eliminating the corrosion failure mode is a meaningful practical advantage. 

Side-by-Side Comparison 

Which to Specify for Australian Applications 

For most construction, earthmoving, and agricultural work in Australia, steel cord is the right choice. The superior tensile strength gives a better safety margin against shock loading relevant when a machine drops into a trench edge or hits an embedded boulder and the dimensional stability means the track holds its pitch geometry under load, which keeps the sprocket engagement correct over the life of the track. 

Fabric cord has legitimate applications. Very light machines under about 1.5 tonnes don’t generate the load that demands steel cord strength. Coastal and marine environments where salt water exposure is sustained make corrosion resistance a genuine factor in the specification decision. Price-sensitive applications where lower initial cost is prioritised over maximum service life can make fabric cord economically sensible. 

The key is being clear about why you’re choosing one over the other, rather than assuming that a cheaper track is equivalent to a more expensive one. They’re different constructions with different performance profiles. 

TFI’s Steel Cord Specification 

Tradefaire International’s standard and premium rubber tracks use high-tensile, brass-plated continuous wound steel cord construction. The cord specification is matched to the machine weight class every track we supply has a reinforcement specification appropriate for the load it will carry, with a design safety factor that covers the shock loads typical of Australian site conditions. 

Our tracks are manufactured in ISO-certified facilities where cord specification, adhesion treatment, and vulcanisation parameters are controlled and documented. We don’t downgrade cord specification to reduce cost the cord is the structural component that makes everything else work. Compromising on it compromises the track. 

Before buying any rubber track, ask the supplier what the cord tensile strength is, what the wire diameter is, and whether it’s continuously wound or discrete. If they can’t answer, the specification is unknown. TFI’s technical team can provide compound and cord specification data for every track in our range call 1300 916 556. 

For advice on steel versus fabric cord for your specific machine and application, contact Tradefaire International. We supply rubber tracks for mini excavators, compact track loaders, ASV Posi-Track machines, and agricultural equipment across Australia.