Option For Replacing P185/65R15 Passenger Tires
Updated 01/05/2026 | Published 09/25/2024
Products Featured in This Question
Question:
Hello, I need some help on picking the right trailer tire. I am putting new tires on a small 5x10 utility trailer that I just bought. The tires on it are a passenger tire P185/65R15. How do I covert that into a trailer tire size so I don’t have to worry about any mounting issues? Thank you!
asked by: Tom
Expert Reply:
Hello Tom, thanks for reaching out. The 185/65R15 tires are sized the same way as trailer tires, but this not a standard trailer tire size. The 185/65R15 tires are going to be about 24.5" in diameter and 7.3" wide. We do have a tire that is similar in size, but nothing in a 15". Our closest option are the ST175/80R13 radial tires. They are 24.1" in diameter and 7" wide so just a hair smaller than the current tires. We offer this tire on a 5 on 4-1/2" galvanized wheel as part # AM31994. As long as your hub is also a 5 on 4-1/2" this will be your best option for a replacement that will not cause any mounting issues. These tires are load range D so 8 ply rated for 1,610 lbs at 65 PSI.
Product Page this Question was Asked From
Karrier ST235/85R16 Radial Trailer Tire - Load Range F
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range F
- 235/85-16
- 16 Inch
- M - 81 mph
- Kenda
more information >
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Jesse M.
1/5/2026
Hey Tom, how did the ST175/80R13 tires work out on your 5x10 utility trailer? It sounds like they were a close match in size to your old passenger tires. Sharing how the fit turned out could help others looking to make the same switch.