265/40R22 vs 305/40R22
305/40R22 is outside the ±3% rule as a replacement for 265/40R22: the diameter differs by +4.15%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 305/40R22 on a car calibrated for 265/40R22, the speedometer reads 57.6 mph when you're really doing 60, and the odometer under-counts by 4.2%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.9 mph |
| 60 mph | 62.5 mph |
| 70 mph | 72.9 mph |
| 80 mph | 83.3 mph |
Other sizes close to 265/40R22
- 265/40R22 vs 275/40R22+1.04%
- 265/40R22 vs 265/35R22-3.44%
- 265/40R22 vs 285/35R22-1.62%
- 265/40R22 vs 285/40R22+2.08%
- 265/40R22 vs 295/40R21-0.18%
- 265/40R22 vs 265/45R21+0.14%
- 265/40R22 vs 275/45R22+4.61%
- 265/40R22 vs 275/35R22-2.53%
- 265/40R22 vs 295/35R22-0.71%
- 265/40R22 vs 315/35R22+1.10%
- 265/40R22 vs 325/35R22+2.01%
- 265/40R22 vs 295/30R22-4.54%
Questions
Can I replace 265/40R22 with 305/40R22?
305/40R22 is outside the ±3% rule as a replacement for 265/40R22: the diameter differs by +4.15%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 265/40R22 and 305/40R22?
305/40R22 is 1.26" taller and 40 mm wider; the sidewall is +0.63". At an indicated 60 mph you'd actually be doing 62.5 mph.
Will 305/40R22 fit on 265/40R22 wheels?
Both use a 22" rim, so the wheel diameter matches; check the wheel's width range for a 305 mm tire and the fender clearance.