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RubberMaster
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular
RubberMaster S378 ST 5.3-12 75M B (4 Ply) 12x4 5 x 114.3 Silver Modular

RubberMaster S378 Tire and Wheel Assembly5.3-12 • 75M • All Season • Highway

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Assembly listings contain tires with rims for sale. The listed price is for both the tire and the rim. The actual bolt pattern of the rim may differ from the one in the photos, please check the Item Specifications for the actual rim type.

This specific tire model features a BIASED ply construction.

There might be discrepancies of sizes between brands and models of tires which have this size formatting. As the manufacturers only provide the tire width and the rim diameter with these tires, various brands and models will have size differences. In order to ensure the correct size is purchased, the overall tire diameter that is needed should be checked.

The Overall Diameter or O.D. advertised represents the tire's overall diameter in inches, once the tire has been properly inflated and mounted per the manufacturer's recommendation. This advertised number is provided to Priority Tire by the tire manufacturer.

Manufacturers recommend changing tires every 10 years. As long as tires are properly stored before they are sold, the year of their manufacture will not shorten their service life.

Tire Specifications

Check out specifications of the tire.

5.3-12
5.3
N/A
12 inches
21.4 inches
M
BrandRubberMaster
Highway
Run flatNo
ModelS378
SKUNA1731161-99
Approved rim widthNot specified
7/32
Sidewall styleBSW: Black Side Wall
75
B (4 Ply)
N/A
All Season
Vehicle typeTrailer
Road Hazard WarrantyNo
Treadlife warrantyNot specified
MPN599425SIL

FAQs

All tires sold on our site are brand new. We do not sell used, retreaded, or reconditioned tires.

All warranties are provided by the tire manufacturers. Priority Tire only offers a 90-day return policy for unused and unmounted tires.

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Shipping
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  • Same-day dispatch if ordered by 1 PM EST on business days
  • Delivery in 1–6 business days, depending on your location
  • Shipped from PA, TX, FL & other U.S. warehouses.
Returns
  • 90-Day Returns on unmounted, unused tires
  • Return shipping is the customer’s responsibility

Tires may ship separately and arrive on different days, even when ordered together.

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With over 8 million satisfied customers across the nation, we’ve built a legacy of trust by delivering premium tires and exceptional service to drivers just like you.

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Explore a massive inventory of over 20 million tires from top-tier brands, ensuring that no matter your vehicle or driving needs, we have the perfect set in stock and ready to ship.

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Installers nationwide

Benefit from our nationwide network of over 25,000 certified local installers, making it easier than ever to have your new tires delivered and professionally mounted close to home.

Our two decades of specialized knowledge ensure every customer receives professional guidance and high-quality products they can trust.

With over 8 million satisfied customers across the nation, we’ve built a legacy of trust by delivering premium tires and exceptional service to drivers just like you.

Explore a massive inventory of over 20 million tires from top-tier brands, ensuring that no matter your vehicle or driving needs, we have the perfect set in stock and ready to ship.

Benefit from our nationwide network of over 25,000 certified local installers, making it easier than ever to have your new tires delivered and professionally mounted close to home.

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