Whats the Modern Tire Size Equivalent of F78/15
Question:
I am purchasing a Interstate cargo trailer 6x14foot single axel. I was wondering how I no which tire and wheel fits this trailer? The tire on my brochure is F78/15 BIAS.
asked by: Kevin M
Expert Reply:
The F78/15 stated in modern tire size terms would be a 205/75-15. When you need replacement tires, I'd recommend going with a radial tire because radials do a better job of shedding heat. Excessive heat build-up is the number one cause of blowouts and premature tire wear.
When the time comes to replace the tires, I'd recommend a Taskmaster radial tire in 205/75-15 load range C as part # TTWTRTM2057515C with a 1820 lb capacity at 50 psi or as part # TTWTRTM2257515D for a load range D with a 2540 lb capacity at 65 psi.
I've linked you to our trailer tire FAQ article, I hope you'll find it helpful.

Products Referenced in This Question
Provider ST225/75R15 Radial Trailer Tire - Load Range D
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range D
- 225/75-15
- 15 Inch
- M - 81 mph
- Taskmaster
more information >
Product Page this Question was Asked From
Provider ST205/75R15 Radial Trailer Tire - Load Range C
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range C
- 205/75-15
- 15 Inch
- M - 81 mph
- Taskmaster
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Trailer Hitch
- Shop: Trailer Wiring
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Shop: EcoHitch Hidden Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Shop: LED Clearance and Side Marker Trailer Light w/ Reflector - 6 Diodes - Rectangle - Amber Lens
- Q&A: Recommended Microwave Replacements For A Magic Chef Microwave In A 2019 Forest River Forester
- Shop: Brake Controller
- Shop: Redarc Tow-Pro Elite Brake Controller w/ Custom Harness - Dash Knob - Off-Road Mode - Up to 3 Axles
- Shop: Provider ST205/75R15 Radial Trailer Tire - Load Range C
- Shop: Curt Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Shop: Side-Door Bar Lock Assembly - 55" Long
- Search Results: awning repair tape
- Search Results: awning tape
- Search Results: eh97fr
- Search Results: rvcolp~2b
- Video: Setting up the Curt Trailer Hitch Receiver on a 2022 Ram 1500
- Search Results: 18159
- Search Results: tph~020
- Search Results: led taillights
- Q&A: Modern Tire Size Equivalent for Replacing F78-15ST
- Q&A: How to Determine the Size of a Trailer Hub Assembly for Replacement
- Video: A Closer Look at the Pollak 7 Pole to 4 Way Connector Adapter
- Q&A: Tire Recommendation to Replace Trailer Tire Size F78-15
- Video: The Low-Down on the Trailer Idler Hub Assembly for 3,500-lb E-Z Lube Axles
- Video: Hands-On with the Trailer Idler Hub Assembly for 3,500-lb Axles
- Shop: Vehicle Tow Bar Wiring
- Q&A: Wrench Needed To Remove Trailer Wheel Lug Nuts and Most Common Lug Nut Sizes on Trailer Wheels
- Article: How to Measure Your Trailer Wheel Bolt Pattern
- Q&A: After How Many Years Should Trailer Tires Be Replaced
- Q&A: Replacement Wheels and ST225/75R15 E Tires for a Car Mate Trailer