Diamondback TR928

Drive smart with the Diamondback TR928, a value-driven touring tyre built for Kiwi roads. Expect reliable wet grip, stable handling, and a comfortable, quiet ride for everyday city and highway use. A robust casing and optimised tread pattern promote even wear and long life, while wide grooves help clear water to reduce aquaplaning. Designed for long kilometres and low running costs, the TR928 delivers confidence, durability, and sharp value. Upgrade to the Diamondback TR928 and get dependable performance without the premium price.

High-Silica Tread Compound. A high-loading, micro-dispersed silica compound with advanced silane coupling optimises the Diamondback TR928’s viscoelastic balance, lowering hysteresis at cruising frequencies for reduced rolling resistance while elevating energy loss in the wet-slip frequency band to boost braking and cornering grip on rain-soaked New Zealand roads. The functionalised polymer backbone improves filler-polymer bonding, cutting heat build-up and tread wear on coarse chipseal, while maintaining flexibility in cooler morning temperatures without sacrificing tread block stability under load. The net effect is confident wet stopping distances, consistent grip across a wide operating window, and improved fuel efficiency over long kilometres.

Four Circumferential Grooves. Deep, continuous main channels work with transverse feeder grooves to accelerate water evacuation from the contact patch, reducing hydrodynamic pressure and delaying the onset of aquaplaning at open-road speeds. The groove layout manages localised contact pressure so more edges stay engaged with the surface film, preserving lateral force generation during lane changes and emergency braking. By stabilising the footprint on saturated surfaces, the TR928 maintains predictable steering input response and braking coherence across varying water depths common on New Zealand motorways and secondary routes.

Rigid Shoulder Blocks. Large, reinforced shoulder elements with inter-block tie-bars increase lateral stiffness, minimising block deformation (squirm) under cornering loads to keep slip angles small and steering feedback precise. The stiffer shoulders also spread deceleration forces more evenly during heavy braking, shortening stopping distances while resisting heel-and-toe wear on outer ribs. This architecture gives the Diamondback TR928 confident turn-in on winding rural roads, improved stability during evasive manoeuvres, and longer service life thanks to lower localised heat generation at the rib edges.

Optimised Contact Patch. A multi-radius mould contour and tuned belt/ply tension distribution create a flatter, more uniform contact pressure map across the tread, equalising load from centre rib to shoulders. This reduces irregular wear modes such as cupping and diagonal wash, especially on coarse chipseal and during frequent stop/start city driving. The stable footprint allows the TR928 to maintain a broad, consistent contact area under braking and at highway speed, improving longitudinal traction, shortening wet and dry stopping distances, and extending usable tread life for lower total cost of ownership.

Full Nylon Cap-Ply. A spirally wound, full-coverage nylon cap-ply stabilises the steel belt package, suppressing circumferential growth and standing-wave formation at sustained highway speeds. This enhances high-speed uniformity and reduces vibration, while lowering inter-ply shear that can accelerate belt-edge fatigue on rough New Zealand surfaces. The cap-ply improves durability by controlling heat build-up, supporting precise balancing, and maintaining tread stability under load, so the Diamondback TR928 delivers consistent performance and ride comfort throughout its wear life.