I know I have posted this in the past. From Goodyear's PSB 2006
THE GOODYEAR TIRE & RUBBER COMPANY
PRODUCT SERVICE DEPARTMENT
Page 1 of 2
Product Service Bulletin
Important Information To Better Service Your Customers
Post For Ready Reference
March 6, 2006
TO: Goodyear Company Owned Outlets
Goodyear Contract Dealers
Subject: Marathon Special Trailer Applications - General Information
Goodyear Marathon tires are widely used in a variety of towable trailer applications and are designed and
branded as â€śSTâ€? (Special Trailer) tires.
This bulletin is designed to help you obtain the best performance from tires with the ST (Special Trailer)
designation. Please review the following important points with your Goodyear Marathon customers.
Industry standards dictate that tires with the ST designation are speed restricted to 65 MPH under
normal inflation and load conditions unless a different speed restriction is indicated on the sidewall of
Based on industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph,
it is necessary to increase the cold inflation pressures by 10 psi above the recommended pressure for the
exceed the maximum pressure for the wheel.
If the maximum pressure for the wheel prohibits the increase of air pressure, then the
maximum speed must be restricted to 65 mph.
The cold inflation pressure must not exceed 10 psi beyond the inflation specified for the
maximum load of the tire.
Drivers should always obey posted speed limits and reduce speeds when necessary based on vehicle,
road, weather or traffic conditions.
Trailers tires should be operated at inflation pressures that are specified by
the trailer manufacturer.
The trailer manufacturerâ€™s inflation information can usually be found in the ownerâ€™s manual, tire
information placard or vehicle certification label, usually located on the forward left side of the trailer.
Cold inflation pressures should be checked every morning during trips and monthly while in storage.