285/45R22 vs 315/45R22
315/45R22 is taller than 285/45R22 by 3.31% — a diameter difference of 1.06″.
What changes between 285/45R22 and 315/45R22
Switching from 285/45R22 to 315/45R22 changes overall diameter by +3.31%, a taller tire by 1.06 inches. This sits in the 3–5% caution band, where rubbing at full steering lock or suspension compression becomes possible. Leveling kits or fender-liner trims are often needed on lifted trucks. Section width moves by +1.18″ (285mm → 315mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.53″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -20, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 67.2 mph. Both sizes share the same 22″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 285/45R22 | 315/45R22 |
|---|---|---|
| Overall diameter | 32.1″ | 33.16″ |
| Section width | 11.22″ (285 mm) | 12.4″ (315 mm) |
| Sidewall height | 5.05″ (45%) | 5.58″ (45%) |
| Rim diameter | 22″ | 22″ |
| Circumference | 100.84″ | 104.18″ |
| Revs per mile | 628 | 608 |
Interactive comparison
275/65R18 or "33" for inch aliases285/45R22
- Diameter
- 32.1″ / 815.3mm
- Section Width
- 11.22″
- Sidewall
- 5.05″ / 128.25mm
- Circumference
- 100.84″
- Revs/Mile
- 628
315/45R22
- Diameter
- 33.16″ / 842.3mm
- Section Width
- 12.4″
- Sidewall
- 5.58″ / 141.75mm
- Circumference
- 104.18″
- Revs/Mile
- 608
Speedometer & Diameter Impact
Wider tire — verify wheel widthAt an indicated 60 mph, your actual speed is 61.99 mph (99.76 km/h). Your speedometer reads 3.31% low versus actual speed.