Could Radial Trailer Tire be used As Spare for Tire Size ST225/75D15
Question:
I have 4 St225 75 D15 tires on my travel trailer can I get a 225 75 R15 as a spare to go with them?
asked by: Peter D
Helpful Expert Reply:
You currently have bias ply tire based on the letter D in your tire size ST225/75D15 and the other size you mentioned is a radial based on the R in the size. Ideally you run the same construction style for all tires including the spare but in an emergency situation you could use a radial to replace a bias ply.
The main difference between a radial ply and a bias ply tire is how the tire is constructed. The cords inside a bias ply tire run at a 32 degree angle to the direction of travel, and the cords on a radial tire run at a 90 degree angle to the direction of travel, or across the tire from wheel lip to wheel lip.
A radial tire flexes more than a bias tire, giving it better ground contact, traction, stability, and tread wear.
A radial tire will normally run cooler than a bias ply tire, especially when the tire is under a load. A tire that runs cooler will last longer.
Product Page this Question was Asked From
Westlake ST225/75R15 Radial Trailer Tire w/ 15" Silver Mod Wheel - 6 on 5-1/2 - Load Range E
- Trailer Tires and Wheels
- Tire with Wheel
- Radial Tire
- Load Range E
- 225/75-15
- 15 Inch
- L - 75 mph
- 6 on 5-1/2 Inch
- Steel Wheels - Powder Coat
- Westlake
more information >
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