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Will ST145/R12 Tires Fit on Trailer That Currently Uses 4.80-12 Tires

Question:

i need a pair of trailer tires the ones that are on say 4.80-12 will the Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E fit

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Expert Reply:

The Karrier S-Trail tire you mentioned, part # AM10140 would most likely fit on your trailer. They are about the same diameter as your existing tires, but are about an inch wider. You would want to check the distance between your existing tires and the side of the trailer frame or inside of the fenders to ensure you have proper clearance. This tire is designed for a 12 x 4 inch rim.

Most 4.80-12 tires are rated for between 785-990 lbs, while the ST145/R12 tires you mentioned are rated much higher at 1520 lbs. Keep in mind that even though you might switch to a tire with a higher load rating, the weight bearing capacity of your trailer will NOT increase. You will still be limited to the capacity of the lowest rated component, be it the tires, axles or the suspension.

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Mike L

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