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Will a ST145/R12 Radial Trailer Tire Fit In Place of a 4.80-12?  

Updated 02/03/2026 | Published 07/04/2024

Question:

Hello, I have a trailer with 2 tires. The tire size is 4.80-12, however, the wheel size measures 13 across. If I purchase a 145/80r12 tire, will it fit?

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Expert Reply:

Yes, the ST145/R12 Radial Trailer Tire # AM10130 will fit in place of your 4.80-12 # AM10062 tires. The reason you wheel is 13" across is on wheels the diameter is measured on the inner diameter of the bead seat area which is the smaller diameter inside the tire beads.

expert reply by:
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Bud M
Jameson C. profile picture
Etrailer Expert

Jameson C.

2/3/2026

Hey, how did the ST145/R12 radial tires work out on your trailer? It’d be great to hear how the fit compared to your old 4.80-12 tires. Your update could make it easier for the next person with the same question.

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