Replacing Existing B78-13ST Tires on Boat Trailer with Modern Equivalent
Question:
I have a 1984 Bass tracker, the spare wheel is a B78-13ST sport traveler 78, I have not found a tire size for the tires on the trailer, they are Carlisle tires. What tires do I need to replace the spare?
asked by: Gordon S
Helpful Expert Reply:
The B78-13ST is an obsolete tire size that's no longer used. A 175/80-13 is the closest modern tire size. The # AM10210 tire you looked at is a 175-80-13 with a D load range radial tire that has a 1,610 lb capacity at 65 psi. You'll want to make sure you replace the tires in pairs.
After several years, tires can start to dry rot. If your spare is more than 6 years old, I'd urge you to replace it even if the tire still appears to have plenty of tread on it.
We also offer that tire size in several wheel/tire combos, which you can see by clicking the provided link.
For instance, we have a 175/80R-13 radial tire on a 13x4-1/2 inch galvanized wheel with a 5 on 4-1/2 inch bolt pattern as part # AM31994. If you'd prefer an aluminum wheel, we offer the same tire size on a 13x5 inch wheel with the same bolt pattern as part # AM32001HWTB.
I'll link you to our Trailer Tire help article that you might find helpful.
![Mike L](https://images.etrailer.com/static/images/catg/people/166_tn.jpg)
Products Referenced in This Question
Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel - 5 on 4-1/2 - Load Range D
- Trailer Tires and Wheels
- Tire with Wheel
- Radial Tire
- Load Range D
- 175/80-13
- 13 Inch
- M - 81 mph
- 5 on 4-1/2 Inch
- Steel Wheels - Galvanized
- Boat Trailer Wheels
- Kenda
more information >
Product Page this Question was Asked From
Karrier ST175/80R13 Radial Trailer Tire - Load Range D
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range D
- 175/80-13
- 13 Inch
- M - 81 mph
- Kenda
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel - 5 on 4-1/2 - Load Range D
- Video: Review of Kenda Trailer Tires and Wheels - Karrier ST205/75R15 LR C Radial Aluminum Wheel - KE43JR
- Shop: Karrier ST205/75R15 Radial Trailer Tire with 15" Aluminum Wheel - 5 on 4-1/2 - Load Range C
- Q&A: What Size Trailer Tires Will Replace B78-13 Trailer Tires
- Shop: Kenda Karrier ST175/80R13 Radial Trailer Tire with 13" Black Mod Wheel - 5 on 4-1/2 - LR D
- Shop: Karrier ST175/80R13 Radial Trailer Tire - Load Range D
- Shop: Karrier ST205/75R15 Radial Trailer Tire with 15" Aluminum Wheel - 5 on 4-1/2 - Load Range D
- Shop: Loadstar ST175/80D13 Bias Trailer Tire with 13" White Wheel - 4 on 4 - Load Range C
- Shop: Loadstar ST175/80D13 Bias Trailer Tire with 13" Galvanized Wheel - 5 on 4-1/2 - Load Range D
- Search Results: 205/75r15
- Search Results: st225/75r15
- Search Results: 15 inch 5 lug aluminum trailer wheel 5 on 45
- Search Results: b78 13st tire
- Shop: Trailer Wiring
- Shop: Suspension Enhancement
- Shop: Trailer Hitch
- Search Results: trailer spare mount
- Search Results: am3s120
- Q&A: Replacement Trailer Hub Assembly for Dexter 8-248 Hubs
- Q&A: Comparing 215/60-8 Tires to 18.5/8.5-8 Tires for Height and Width
- Search Results: solar battery charger
- Q&A: Which Trailer Tire Size Replaces B78-13B Tires
- Q&A: Recommendation to Replace B78-13ST Tires on Boat Trailer
- Article: How to Measure Your Trailer Wheel Bolt Pattern
- Q&A: Will Higher Rated Tires Increase My Trailer's Weight Capacity
- Q&A: Direct Replacement Converter for Parallax/Magnetek 6345 RV Power Converter
- Article: Printable Trailer Bolt Hole Pattern Template
- Article: Replacing the Bearing, Races and Seals on a Trailer Hub
- Video: Yates Rubber Boat Trailer Parts - Bow Guard - YRJONBLOCK Review
- Video: Review of Kenda Trailer Tires and Wheels - Tire with Wheel - AM31952