265/35R22 vs 265/40R21
265/40R21 is a safe swap for 265/35R22 by the usual ±3% rule: the diameter differs by +0.15%.
Speedometer and odometer
With 265/40R21 on a car calibrated for 265/35R22, the speedometer reads 59.9 mph when you're really doing 60, and the odometer under-counts by 0.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.0 mph |
| 45 mph | 45.1 mph |
| 60 mph | 60.1 mph |
| 70 mph | 70.1 mph |
| 80 mph | 80.1 mph |
Other sizes close to 265/35R22
- 265/35R22 vs 295/35R21-0.59%
- 265/35R22 vs 275/40R22+4.64%
- 265/35R22 vs 265/40R22+3.56%
- 265/35R22 vs 255/40R21-0.93%
- 265/35R22 vs 285/35R22+1.88%
- 265/35R22 vs 275/35R22+0.94%
- 265/35R22 vs 295/35R22+2.82%
- 265/35R22 vs 315/35R22+4.70%
- 265/35R22 vs 285/30R22-1.95%
- 265/35R22 vs 295/30R22-1.14%
- 265/35R22 vs 315/30R22+0.47%
- 265/35R22 vs 255/40R22+2.49%
Questions
Can I replace 265/35R22 with 265/40R21?
265/40R21 is a safe swap for 265/35R22 by the usual ±3% rule: the diameter differs by +0.15%.
What's the difference between 265/35R22 and 265/40R21?
265/40R21 is 0.04" taller and 0 mm wider; the sidewall is +0.52". At an indicated 60 mph you'd actually be doing 60.1 mph.
Will 265/40R21 fit on 265/35R22 wheels?
No — 265/35R22 needs a 22" wheel and 265/40R21 a 21" wheel. This is a plus/minus-size swap that changes wheels too.