Sumitomo ST528 Commercial Truck & Bus All-Position Radial Tire

The Sumitomo ST528 is a medium-duty commercial truck and bus tire engineered for on/off-highway mixed-service applications. Designed as a true all-position radial, the ST528 delivers consistent, dependable performance across steer, drive, and trailer axle positions — making it a versatile, cost-effective solution for fleet operators running regional delivery, refuse hauling, utility work, and municipal routes.

At the core of the ST528 is a four-steel-belt casing construction that resists punctures, improves vehicle stability under load, and supports multiple retread cycles — maximizing return on investment for fleet managers. Rust-inhibiting compounds coat all interior steel belt and body ply components, protecting the casing structure from corrosion throughout the tire's extended service life.

Key Features:

• Deep Tread Depth — Maximizes time in service and delivers strong traction across all wheel positions
• Patented Cut & Chip Resistant Tread Compound — Application-specific rubber compound guards against tread damage in high-scuff, mixed-terrain environments
• Steel Belt Rust Inhibitor Technology — Proprietary rust-inhibiting compounds protect all interior steel belt and body ply components from corrosion, extending casing life and retreadability
• Enhanced Undertread Thickness — Extra-thick undertread layer shields the belt and ply package from punctures and road hazard penetration
• Sidewall Curb Defense Ribs — Reinforced curbing ribs provide added protection against sidewall damage in urban and tight-corridor operations
• Stone Ejector Design — Groove geometry engineered to prevent stone retention and protect the casing base from stone drilling
• Wide Grooves for Wet Traction — Broad tread grooves efficiently evacuate water and slush from the contact patch, reducing hydroplaning risk in wet and mixed-weather conditions
• Ribbed Tread Pattern — Promotes even pressure distribution across the contact patch to resist irregular wear and enhance steering responsiveness
• True All-Position Design — Rated for reliable service on steer, drive, and trailer positions across a wide range of commercial vehicle configurations
• Multiple Retread Cycles Supported — Robust four-steel-belt casing is engineered to support retreading, lowering total fleet tire cost per mile
• Sumitomo Tire Limited Warranty — Backed by Sumitomo's manufacturer warranty program for added peace of mind

The ST528's combination of a durable tread compound, reinforced internal structure, and intelligent tread geometry makes it a dependable choice for fleet operators who demand long service life and low-maintenance performance across highway and mixed-surface environments. Available in a range of sizes to suit a variety of medium-duty commercial truck and bus applications.