265/30R19 vs 235/40R19
235/40R19 is outside the ±3% rule as a replacement for 265/30R19: the diameter differs by +4.52%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 235/40R19 on a car calibrated for 265/30R19, the speedometer reads 57.4 mph when you're really doing 60, and the odometer under-counts by 4.5%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.4 mph |
| 45 mph | 47.0 mph |
| 60 mph | 62.7 mph |
| 70 mph | 73.2 mph |
| 80 mph | 83.6 mph |
Other sizes close to 265/30R19
- 265/30R19 vs 225/40R18-0.69%
- 265/30R19 vs 235/40R18+0.56%
- 265/30R19 vs 255/35R19+3.04%
- 265/30R19 vs 255/35R18-0.92%
- 265/30R19 vs 245/35R19+1.95%
- 265/30R19 vs 225/40R19+3.27%
- 265/30R19 vs 235/35R19+0.86%
- 265/30R19 vs 265/35R18+0.17%
- 265/30R19 vs 265/35R19+4.13%
- 265/30R19 vs 285/30R19+1.87%
- 265/30R19 vs 225/35R19-0.23%
- 265/30R19 vs 305/30R19+3.74%
Questions
Can I replace 265/30R19 with 235/40R19?
235/40R19 is outside the ±3% rule as a replacement for 265/30R19: the diameter differs by +4.52%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 265/30R19 and 235/40R19?
235/40R19 is 1.14" taller and 30 mm narrower; the sidewall is +0.57". At an indicated 60 mph you'd actually be doing 62.7 mph.
Will 235/40R19 fit on 265/30R19 wheels?
Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 235 mm tire and the fender clearance.