265/55R19 vs 305/50R19
305/50R19 is taller than 265/55R19 by 1.74% — a diameter difference of 0.53″.
What changes between 265/55R19 and 305/50R19
Switching from 265/55R19 to 305/50R19 changes overall diameter by +1.74%, a taller tire by 0.53 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 +1.58″ (265mm → 305mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.26″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -12, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 66.1 mph. Both sizes share the same 19″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 265/55R19 | 305/50R19 |
|---|---|---|
| Overall diameter | 30.48″ | 31.01″ |
| Section width | 10.43″ (265 mm) | 12.01″ (305 mm) |
| Sidewall height | 5.74″ (55%) | 6″ (50%) |
| Rim diameter | 19″ | 19″ |
| Circumference | 95.74″ | 97.41″ |
| Revs per mile | 662 | 650 |
Interactive comparison
275/65R18 or "33" for inch aliases265/55R19
- Diameter
- 30.48″ / 774.1mm
- Section Width
- 10.43″
- Sidewall
- 5.74″ / 145.75mm
- Circumference
- 95.74″
- Revs/Mile
- 662
305/50R19
- Diameter
- 31.01″ / 787.6mm
- Section Width
- 12.01″
- Sidewall
- 6″ / 152.5mm
- Circumference
- 97.41″
- Revs/Mile
- 650
Speedometer & Diameter Impact
Wider tire — verify wheel widthAt an indicated 60 mph, your actual speed is 61.05 mph (98.24 km/h). Your speedometer reads 1.74% low versus actual speed.