265/30R19 vs 225/40R19
225/40R19 is taller than 265/30R19 by 3.27% — a diameter difference of 0.83″.
What changes between 265/30R19 and 225/40R19
Switching from 265/30R19 to 225/40R19 changes overall diameter by +3.27%, a taller tire by 0.83 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 -1.57″ (265mm → 225mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.41″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -25, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 67.1 mph. Both sizes share the same 19″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 265/30R19 | 225/40R19 |
|---|---|---|
| Overall diameter | 25.26″ | 26.09″ |
| Section width | 10.43″ (265 mm) | 8.86″ (225 mm) |
| Sidewall height | 3.13″ (30%) | 3.54″ (40%) |
| Rim diameter | 19″ | 19″ |
| Circumference | 79.36″ | 81.95″ |
| Revs per mile | 798 | 773 |
Interactive comparison
275/65R18 or "33" for inch aliases265/30R19
- Diameter
- 25.26″ / 641.6mm
- Section Width
- 10.43″
- Sidewall
- 3.13″ / 79.5mm
- Circumference
- 79.36″
- Revs/Mile
- 798
225/40R19
- Diameter
- 26.09″ / 662.6mm
- Section Width
- 8.86″
- Sidewall
- 3.54″ / 90mm
- Circumference
- 81.95″
- Revs/Mile
- 773
Speedometer & Diameter Impact
Narrower tire — verify wheel widthAt an indicated 60 mph, your actual speed is 61.96 mph (99.72 km/h). Your speedometer reads 3.27% low versus actual speed.