Recommended Replacement for H78-14 Tires on Boat Trailer
Question:
Replacing ties on a dual axle E Z loader boat trailer. Boat weight is 4100 lbs. Current dry rotted tires are H78x14. What size and load rated tires are needed? Does number of axles play into load rating of the tires?
asked by: Jim S
Expert Reply:
We have the exact tires that you need to replace your old dry-rotted tires, but to answer your last question, the number of axles (and therefore the number of tires) does play into load rating. Each tire has its own rating, and the way it works is the total capacity is the combined total of the capacity for each tire - so for a tandem axle trailer, you simple combine the load capacity of all four tires to get their total weight capacity.
The correct replacement size for H78-14 tires is ST215/75-14 and we have a pair of great options for you.
Though you mentioned your boat weighs 4,100 lbs, the determining factor in the load capacity you need will be your trailer's GVWR - this is the maximum your trailer will weigh when loaded. You will need to get tires that meet or exceed that GVWR, which is something you can often find on a sticker on the trailer tongue.
I recommend the Provider ST215/75R14 Radial Trailer Tires because of their deep 10/32" tread depth as well as their tread bars so not only will these tires give you outstanding grip but it will be very easy to tell how much wear they have accumulated.
These tires come in load range C and load range D: If your trailer has a GVWR between 7,480 lbs and 8,800 lbs you will need the Provider ST215/75R14 Radial Trailer Tire - Load Range D # TTWTRTM2157514D which has a maximum capacity of 2,200 lbs per tire when it is inflated to its max 65 psi.
If your trailer has a GVWR of less than 7,480 lbs you will need the Provider ST215/75R14 Radial Trailer Tire - Load Range C # TTWTR21514 which has a maximum capacity of 1,870 lbs per tire when it is inflated to its max 50 psi.
I've added links to video reviews of both tires for you to check out.
Products Referenced in This Question
Provider ST215/75R14 Radial Trailer Tire - Load Range C
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range C
- 215/75-14
- 14 Inch
- M - 81 mph
- Taskmaster
more information >
Product Page this Question was Asked From
Provider ST215/75R14 Radial Trailer Tire - Load Range D
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range D
- 215/75-14
- 14 Inch
- M - 81 mph
- Taskmaster
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Trailer Axle w/ Electric Brakes - Easy Grease - 6 on 5-1/2 - 86-1/2" Long - 6,000 lbs
- Shop: 6-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 26" Long
- Shop: Dexter Trailer Axle w/ Electric Brakes - E-Z Lube - 6 on 5-1/2 Bolt Pattern - 86-1/2" - 6K
- Video: Timbren Axle-Less Trailer Suspension System Installation
- Shop: Dexter Trailer Axle Beam with E-Z Lube Spindles - 86-1/2" Long - 5,200 lbs
- Shop: CE Smith U-Bolt Kit for Mounting 5.2K to 7K, Round Trailer Axles - 7" Long U-Bolts - Zinc
- Shop: Trailer Axle Beam with Easy Grease Spindles - 86-1/2" Long - 5,200 lbs
- Shop: Trailer Axle with Idler Hubs - 5 on 4-1/2 Bolt Pattern - 89" Long - 3,500 lbs
- Q&A: 89 Inch Axle With 74 Inch Spring Center to Spring Center Length
- Shop: Grille Guard
- Shop: Replacement Mirrors
- Video: Review of TruRyde Trailer Spindles - EZ Lube Spindle - TRU74FR
- Video: Review of Dexter Axle Trailer Brakes - Uni Servo Hydraulic Left, Right Brake Assembly - T2351300-200
- Video: Review of etrailer Trailer Axles - 89 Inch 6,000 lb Trailer Axle with Electric Brakes - e65SR
- Video: Dexter Axle Trailer Brakes - Electric Drum Brakes - 23-112-113 Review
- Q&A: Is there an Advantage to Going to a Higher Load Range Tire on a Trailer
- Q&A: Can Trailer Tire Size of ST205/75-14 be Replaced with ST215/75-14
- Q&A: What to Consider When Converting Single Axle Trailer to Tandem Axle
- Video: etrailer Trailer Axle 4-Leaf Double-Eye Spring Installation - Boat Trailer
- Video: Dexter Trailer Axle Beam - EZ-Lube Spindles - 3,500 lbs Installation
- Article: Trailer Tire Sizing
- Q&A: Spare Tire & Wheel For 2023 Coleman Lantern 17B
- Q&A: What is the Difference Between ST205/75-14 and ST215/75-14 Size Tires
- Q&A: What is the Difference Between Load Range C and D ST175/80D13 Trailer Tires
- Article: How to Tell the Weight Rating of a Trailer Axle
- Article: Trailer Wiring Diagrams
- Article: 5 Tell-Tale Signs It’s Time to Replace Your Trailer’s Leaf Springs
- Article: 7 Common Questions Everyone Has About Trailer Tires
- Article: How Much Does a Boat and Trailer Weigh?
- Article: Overview of Lubricating Grease
on Trailer Tires and Wheels
