275/45R22 vs 315/40R22
315/40R22 is taller than 275/45R22 by 0.56% — a diameter difference of 0.18″.
What changes between 275/45R22 and 315/40R22
Switching from 275/45R22 to 315/40R22 changes overall diameter by +0.56%, a taller tire by 0.18 inches. This lands inside the ±3% fitment safe zone, so most vehicles will accept the swap without rubbing, speedometer recalibration, or ABS/TPMS complications. Section width moves by +1.57″ (275mm → 315mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.09″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -3, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 65.4 mph. Both sizes share the same 22″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 275/45R22 | 315/40R22 |
|---|---|---|
| Overall diameter | 31.74″ | 31.92″ |
| Section width | 10.83″ (275 mm) | 12.4″ (315 mm) |
| Sidewall height | 4.87″ (45%) | 4.96″ (40%) |
| Rim diameter | 22″ | 22″ |
| Circumference | 99.73″ | 100.28″ |
| Revs per mile | 635 | 632 |
Interactive comparison
275/65R18 or "33" for inch aliases275/45R22
- Diameter
- 31.74″ / 806.3mm
- Section Width
- 10.83″
- Sidewall
- 4.87″ / 123.75mm
- Circumference
- 99.73″
- Revs/Mile
- 635
315/40R22
- Diameter
- 31.92″ / 810.8mm
- Section Width
- 12.4″
- Sidewall
- 4.96″ / 126mm
- Circumference
- 100.28″
- Revs/Mile
- 632
Speedometer & Diameter Impact
Wider tire — verify wheel widthAt an indicated 60 mph, your actual speed is 60.33 mph (97.1 km/h). Your speedometer reads 0.56% low versus actual speed.