245/35ZR19 vs 225/40R19
225/40R19 is taller than 245/35ZR19 by 1.30% — a diameter difference of 0.34″.
What changes between 245/35ZR19 and 225/40R19
Switching from 245/35ZR19 to 225/40R19 changes overall diameter by +1.30%, a taller tire by 0.34 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 -0.79″ (245mm → 225mm), which affects contact patch and fender-well clearance. Sidewall height shifts by +0.16″: a taller sidewall softens ride quality and adds off-road bump protection, with some loss of steering crispness. Revs per mile moves by -10, which translates directly to speedometer error — at an indicated 65 mph, actual speed becomes 65.8 mph. Both sizes share the same 19″ rim, so no wheel change is required — this is a pure tire-only swap.
| Spec | 245/35ZR19 | 225/40R19 |
|---|---|---|
| Overall diameter | 25.75″ | 26.09″ |
| Section width | 9.65″ (245 mm) | 8.86″ (225 mm) |
| Sidewall height | 3.38″ (35%) | 3.54″ (40%) |
| Rim diameter | 19″ | 19″ |
| Circumference | 80.9″ | 81.95″ |
| Revs per mile | 783 | 773 |
Interactive comparison
275/65R18 or "33" for inch aliases245/35ZR19
- Diameter
- 25.75″ / 654.1mm
- Section Width
- 9.65″
- Sidewall
- 3.38″ / 85.75mm
- Circumference
- 80.9″
- Revs/Mile
- 783
225/40R19
- Diameter
- 26.09″ / 662.6mm
- Section Width
- 8.86″
- Sidewall
- 3.54″ / 90mm
- Circumference
- 81.95″
- Revs/Mile
- 773
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 60.78 mph (97.82 km/h). Your speedometer reads 1.30% low versus actual speed.