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National
National ROAD MAX ST 225/75R15
National ROAD MAX ST 225/75R15
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Looking for a 225/75R15 tire? The National ROAD MAX ST is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 225/75R15 means
In the size 225/75R15, 225 is the section width in millimeters (8.86 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 168.8 mm (6.64 in) — R denotes radial construction, and 15 is the wheel diameter in inches. That works out to an overall diameter of about 28.29 inches, turning roughly 713 revolutions per mile. Overall diameter is what matters for speedometer accuracy and clearance when you change sizes, so compare it — not just the width — against your current tire.
The service description on this tire decodes to a load index of 113 — a maximum load of 2,535 lbs per tire. The speed symbol M corresponds to a maximum sustained speed of 81 mph.
Specifications
| Size | 225/75R15 |
| Service Description | 113M |
| Load Index | 113 |
| Speed Rating | M |
| Section Width (mm) | 225 |
| Aspect Ratio | 75 |
| Temperature Grade | TIRE RIM DIAMETER=15TIRE TYPE=TRACTION=TREAD WEAR=TREAD DEPTH=UQTG=WARRANTY= |
Frequently asked questions
Will 225/75R15 tires fit my vehicle?
Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 225/75R15, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.
How fast does this tire ship?
Every order at ThreePiece.us ships free, with fast delivery from a nationwide warehouse network. Affirm financing is available at checkout.
What does 113M mean on the National ROAD MAX ST?
113M breaks down as load index 113 — rated for 2,535 lbs per tire — with an M speed rating, good for a maximum sustained 81 mph.
Keep shopping
Browse National tires, see every National ROAD MAX ST size, or view all tires at ThreePiece.us.
- BRAND:
- National
- MODEL:
- ROAD MAX ST
- SIZE:
- 225/75R15
- ASPECT RATIO:
- 75
- LOAD INDEX:
- 113
- SECTION WIDTH:
- 225
- SERVICE DESCRIPTION:
- 113M
- SPEED INDEX:
- M
- TEMPERATURE:
- TIRE RIM DIAMETER=15TIRE TYPE=TRACTION=TREAD WEAR=TREAD DEPTH=UQTG=WARRANTY=
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