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What is the Correct Cold Tire Pressure for a ST215/75R14 Trailer Tire  

Updated 06/03/2025 | Published 06/11/2015

Question:

what is the tire pressure for st215/75r14 trailer tire. i purchased a spare from you .

0

Expert Reply:

The correct tire pressure for a trailer tire will be indicated on the tire sidewall. Trailer tires should always be inflated to the full cold psi pressure noted on the tire. They should never be run under- or over-inflated since this can reduce their load capacity and lead to overheating.

Tires will vary in their required pressure based on their rated load range. For example, the linked page will show you radial tires in the ST215/75R14 size you referenced. The D-range tire # TTWTRTM2157514D requires 65-psi, the C-range tire # TTWTR21514 requires 50-psi.

expert reply by:
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Adam R
Leah profile picture

Leah

6/2/2025

I need to know what psi is for the same tire. I am unable to find it on the tire. It is for a trailer. Thank you for responding.

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Jameson C. profile picture
Etrailer Expert

Jameson C.

6/2/2025

@Leah Is there a Load Range letter on the tire sidewall anywhere?
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Leah profile picture

Leah

6/3/2025

@JamesonC I can’t find any. I googled the tire size and it says psi should be 50. Guess I’ll go with that. Thank you for your response.
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Jameson C. profile picture
Etrailer Expert

Jameson C.

6/3/2025

@Leah I can't post pictures here but if you check out this link you'll see what the psi requirement is: https://images.etrailer.com/static/images/pics/t/t/ttwtrtm2157514d_12_1000.jpg
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