How to Get Wider Tires on Trailer With ST145R12 Tires
Question:
I guess I should say wider as in 8 inch of tread area
asked by: JOEL P
Expert Reply:
The 5.7 inch width of a ST145/R12 tire is by far the widest 12 inch tire, so in order to get a wider tire you will need to upgrade to a ST175/80R13 tire, which measures 7 inches wide. This means you will also need new, 13 inch wheels for the tires to fit.
Assuming you have the clearance and you have a 5 on 4-1/2" bolt pattern (if you aren't sure you can use the guide/template I linked below), you simply need to choose the option with the correct load capacity, either C or D:
- Load Range C, 1,360 lbs: Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel # AM31952
- Load Range D, 1,610 lbs: Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel # AM31994
Then for lug nuts what you will need are the Trailer Wheel Lug Nut - 1/2"-20 - Stainless Steel # KALN1375S.
Finally, please keep in mind that you still need to have at least 3" of clearance from the top of the tire to your fender and at least 1" of clearance between the inside of the tire and your trailer's frame rail.
Products Referenced in This Question
Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel - 5 on 4-1/2 - Load Range C
- Trailer Tires and Wheels
- Tire with Wheel
- Radial Tire
- Load Range C
- 175/80-13
- 13 Inch
- M - 81 mph
- 5 on 4-1/2 Inch
- Steel Wheels - Galvanized
- Boat Trailer Wheels
- Kenda
more information >
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 >
Provider ST205/75R14 Radial Trailer Tire w/ 14" Vesper White Mod Wheel - 5 on 4-1/2 - LR C
- Trailer Tires and Wheels
- Tire with Wheel
- Radial Tire
- Load Range C
- 205/75-14
- 14 Inch
- M - 81 mph
- 5 on 4-1/2 Inch
- Steel Wheels - Powder Coat
- Taskmaster
more information >
Product Page this Question was Asked From
Kodiak Trailer Wheel Lug Nut - Stainless Steel - 1/2" - Qty 1
- Accessories and Parts
- Boat Trailer Wheels
- Golf Cart Tires and Wheels
- Trailer Tires and Wheels
- Wheel Lug Nut
- 1/2 Inch Wheel Bolt
- Acorn Nut
- 13/16 Inch Outer Diameter
- 60-Degree Cone
- Stainless Steel
- Kodiak
more information >
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Joel Z.
12/2/2021
I guess I should say wider as in 8 inch of tread area