FINDLAY, Ohio — Cooper Tire & Rubber Co. has added a mixed-service tire, the RM351 HD, to its Roadmaster brand portfolio, replacing the RM300 HH.
The RM351 HD is engineered for both on- and off-road applications such as construction, logging and mining operations, Cooper said. It will be available in two sizes, 11R22.5 and 11R24.5, in load range H.
The RM351 HD is an inch wider than the RM300 HH it's replacing, with a 20- percent larger footprint and a full 32/32nds-inch tread depth, Cooper said. These attributes yield up to 25-percent more miles to removal – depending upon the application.
"By going wider, we spread the weight over the tire to gain better mileage, while also improving traction," Gary Schroeder, executive director of Cooper's global truck and bus tire business, said. "It's a win-win."
To help ensure long tire life, tie bars between the outside lug and the shoulder, along with shoulder grooves that are linked and interlocked, help ward off tire squirm and irregular wear, Cooper said. The "extra thick" sidewall has a curb bar protector to help protect the casing from cuts and scrubbing.
Tthe tire features five lugs that have an open pattern to minimize stone holding while enhancing traction, along with stone-ejector ledges and angled grooves, also designed to help prevent stone drilling.
"That's a key feature of the tire as it will be used off-road where sharp stones can be a tire's worst enemy if they're allowed to drill into the casing," Mr. Schroeder said, adding these features helps preserve the casing for multiple retreads.
Cooper backs the RM351 HD with a six year, two retread warranty.