What Tire Pressure Is Recommended On 4.80/4.00-8 Load Range C Trailer Tire For Highway Speeds
Updated 01/09/2026 | Published 07/29/2010
Question:
I just bought this boat and trailer 14 alum Grumman / galv trailer Tires are 4.80-4.00-8 K371-006 Max rating 90 psi 745 lbs What tire pressure should I run for highway driving? 90 psi seems like a lot. Thanks!!
asked by: Greg
Expert Reply:
The tires should be inflated to 90 psi on the highway as well as other roads, regardless of load size. The problem is that under inflating a trailer tire will lead to degradation of the tire.
On trailer tires, the side walls are thicker than on car tires so they can handle more vertical load. An under inflated tire side wall will heat up more often and quicker and will lead to early wear and possible failure of the tire. The best thing to do is to follow the rating on the tires and inflate them to the maximum recommended psi. Also, trailer tires are speed rated for 65 miles per hour maximum.
i have incldued a link to our tire FAQ article for you.
Product Page this Question was Asked From
Kenda K371 Bias Trailer Tire - 4.80/4.00-8 - Load Range C
- Trailer Tires and Wheels
- Tire Only
- Bias Ply Tire
- Load Range C
- 4.80/4.00-8
- 8 Inch
- Kenda
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Thomas S.
6/17/2020
I have a set of carlisle 4.80-8 2 ply load range b on my trailer that I tow behind my motorcycle and am wondering what should the air pressure be. The trailer empty weighs 100 pounds and the max would be 300 pounds so right now I get a lot of bounce and only see about 2 inches of the center tread making contact with the pavement if even that amount and by the way this trailer is about 30 inches wide. Can you help me out here?