265/50R19 vs 255/55R19
255/55R19 is taller than 265/50R19 by 2.07% — a diameter difference of 0.61″.
What changes between 265/50R19 and 255/55R19
Switching from 265/50R19 to 255/55R19 changes overall diameter by +2.07%, a taller tire by 0.61 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 -0.39″ (265mm → 255mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.30″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -14, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 66.3 mph. Both sizes share the same 19″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 265/50R19 | 255/55R19 |
|---|---|---|
| Overall diameter | 29.43″ | 30.04″ |
| Section width | 10.43″ (265 mm) | 10.04″ (255 mm) |
| Sidewall height | 5.22″ (50%) | 5.52″ (55%) |
| Rim diameter | 19″ | 19″ |
| Circumference | 92.47″ | 94.38″ |
| Revs per mile | 685 | 671 |
Interactive comparison
275/65R18 or "33" for inch aliases265/50R19
- Diameter
- 29.43″ / 747.6mm
- Section Width
- 10.43″
- Sidewall
- 5.22″ / 132.5mm
- Circumference
- 92.47″
- Revs/Mile
- 685
255/55R19
- Diameter
- 30.04″ / 763.1mm
- Section Width
- 10.04″
- Sidewall
- 5.52″ / 140.25mm
- Circumference
- 94.38″
- Revs/Mile
- 671
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 61.24 mph (98.56 km/h). Your speedometer reads 2.07% low versus actual speed.