255/60R18 vs 295/55R18
295/55R18 is taller than 255/60R18 by 2.42% — a diameter difference of 0.73″.
What changes between 255/60R18 and 295/55R18
Switching from 255/60R18 to 295/55R18 changes overall diameter by +2.42%, a taller tire by 0.73 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″ (255mm → 295mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.37″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -16, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 66.6 mph. Both sizes share the same 18″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 255/60R18 | 295/55R18 |
|---|---|---|
| Overall diameter | 30.05″ | 30.78″ |
| Section width | 10.04″ (255 mm) | 11.61″ (295 mm) |
| Sidewall height | 6.02″ (60%) | 6.39″ (55%) |
| Rim diameter | 18″ | 18″ |
| Circumference | 94.4″ | 96.68″ |
| Revs per mile | 671 | 655 |
Interactive comparison
275/65R18 or "33" for inch aliases255/60R18
- Diameter
- 30.05″ / 763.2mm
- Section Width
- 10.04″
- Sidewall
- 6.02″ / 153mm
- Circumference
- 94.4″
- Revs/Mile
- 671
295/55R18
- Diameter
- 30.78″ / 781.7mm
- Section Width
- 11.61″
- Sidewall
- 6.39″ / 162.25mm
- Circumference
- 96.68″
- Revs/Mile
- 655
Speedometer & Diameter Impact
Wider tire — verify wheel widthAt an indicated 60 mph, your actual speed is 61.45 mph (98.9 km/h). Your speedometer reads 2.42% low versus actual speed.