Free rolling wheels need to be as strong as possible to carry all that load on their shoulders. In this case, Sumitomo chose to focus on the quality and strength of their models and came up with the ST770. It is designed for only one position of the axle but ultimately excels in it. This model ensures that heavy commercial trailers remain stable and intact due to the advanced technology of its design.
First of all, the unique shoulder pattern features a closed shape along with notching that greatly reduces the effect of scraping in sharp curves. Next, it benefits from four wide channels that boost traction on both wet and dry surfaces at a maximum speed of 68 mph. Moreover, the deep shape of these grooves combats water retention for trailer stability during rain. The all new rubber compound is highly resistant to scratches and chips, thus promoting long mileage. The innovative sidewall build ensures strong lateral grip and tire integrity.
Furthermore, the ST770 takes advantage of a well structured internal build that offers increased protection against outside factors. The four steel belts under the tread allow nothing to pass through them, therefore protecting the tube. Besides, this design guarantees trailer balance with single loads up to 9,370 lbs on uneven roads while also contributing to more retread cycles. A wide footprint creates more contact with the pavement which reduces uneven wear and enhances grip.
Finally, all season tread design offers high performance all year round. Along with the tire, Sumitomo gives us a 6 year or 2 recap casing warranty. The ST770 comes on the US market in one of the most searched sizes: 385/65 R22.5.
Features and benefits
- Impressive tread design makes for a premium trailer service tire.
- Unique notching in the shoulder ribs minimizes scuffing during turns.
- Four wide channels enhance traction and braking power on wet and dry roads.
- Modern tread composition offers high durability to chips and cuts.
- Stiff sidewalls combat lateral forces and improve road grip.
- Strong internal construction protects the tire from punctures and maximizes stability.
