What is the Difference Between Load Range C and D ST175/80D13 Trailer Tires
Updated 11/15/2021 | Published 11/04/2011 >
Products Featured in This Question
Question:
My trailer tires are branded ST175/80D13 Load Range C. These tires are also ST175/80D13 but Load Range D. My question is how do they differ, size wise? Sould they still fit my trailer without tire rub?
asked by: John B
Expert Reply:
The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity.
For a ST175/80D13 like # AM1ST77, the capacity is 1,610 pounds at 65 psi. For a C load range in the same size, like # AM1ST76 , the capacity is 1,360 pounds at 50 psi. Adding the D load range tires of the same size will fit your trailer, but they will not allow you to carry more weight even if they are rated higher. You will still need to go by the axle capacity.
Always make sure that you inflate a trailer tire to the maximum psi rating as indicated on the tire for the best performance and longest life. I have included a link to our FAQ article on trailer tires for you.


Ken W.
11/11/2021
I have a single axle jetski trailer with 175/80D13 tires. How do I determine the axel rating?

Product Page this Question was Asked From
Loadstar ST175/80D13 Bias Trailer Tire - Load Range D
- Trailer Tires and Wheels
- Tire Only
- Bias Ply Tire
- Load Range D
- 175/80-13
- 13 Inch
- M - 81 mph
- Kenda
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Kenda Karrier ST205/75R15 Trailer Tire with Black Mod Wheel - 5 on 4-1/2
- Shop: Kenda Karrier KR53 ST205/75R14 Radial Trailer Tire with 14" Silver Mod Wheel - 5 on 4-1/2
- Shop: Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel - 5 on 4-1/2 - Load Range D
- Shop: Kenda Karrier KR53 ST205/75R15 Radial Trailer Tire with 15" Black Mod Wheel - 5 on 4-1/2
- Video: Review of Kenda Trailer Tires and Wheels - Tire with Wheel - KE95EV
- Shop: Kenda Karrier ST175/80R13 Radial Trailer Tire with 13" Black Mod Wheel - 5 on 4-1/2 - LR D
- Video: Review of Kenda Trailer Tires and Wheels - Tire with Wheel - AM31990
- Q&A: What is the Difference Between Load Range C and Load Range D Tires
- Search Results: trailer tires and wheels
- Article: How to Measure Your Trailer Wheel Bolt Pattern
- Shop: Loadstar ST205/75D15 Trailer Tire with Silver Mod Wheel - 5 on 5
- Shop: Trailer Hitch
- Shop: Kenda Karrier KR53 ST175/80R13 Radial Trailer Tire with 13" Black Mod Wheel - 5 on 4-1/2
- Article: 7 Common Questions Everyone Has About Trailer Tires
- Search Results: spare tire mount
- Search Results: lug nuts
- Shop: Trailer Wiring
- Shop: Bumpers
- Shop: Brake Controller
- Search Results: st20575r15
- Q&A: Increasing Wheel and Tire Size On a Shorelander Boat Trailer With 4.80-8" Wheels And Tires
- Search Results: kenda trailer tires and wheels
- Search Results: trailer center caps
- Search Results: center caps
- Q&A: Which Holds Up Better on Trailer Wheel Powder Coat or Acrylic Paint
- Shop: Suspension Enhancement
- Video: How to Choose a Trailer Brake Controller
- Video: What to Know About the Kenda Karrier ST185/80R13 Radial Trailer Tire
- Q&A: How To Determine the Correct Size Lug Nuts For a Trailer
- Shop: BOLT brand vehicle and hitch locks
Brian P.
7/2/2020
You should also explain that to get the maximum value from a trailer, the axle rating and tires should be compatible. For example, if you have a single axle trailer and that axle is rated at 4k lbs, each tire should have a max load rating of 2k lbs, thus the combined tires equal the rating of the axle. Do not put tires on a trailer with a lower rating than the axle and still think you can haul the amount of weight the axle is rated for.