295/35R21 vs 265/45R21
265/45R21 is outside the ±3% rule as a replacement for 295/35R21: the diameter differs by +4.32%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 265/45R21 on a car calibrated for 295/35R21, the speedometer reads 57.5 mph when you're really doing 60, and the odometer under-counts by 4.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.3 mph |
| 45 mph | 46.9 mph |
| 60 mph | 62.6 mph |
| 70 mph | 73.0 mph |
| 80 mph | 83.5 mph |
Other sizes close to 295/35R21
- 295/35R21 vs 255/45R20-0.32%
- 295/35R21 vs 265/45R20+0.89%
- 295/35R21 vs 265/40R21+0.74%
- 295/35R21 vs 275/35R21-1.89%
- 295/35R21 vs 255/40R21-0.34%
- 295/35R21 vs 265/35R21-2.84%
- 295/35R21 vs 265/35R22+0.59%
- 295/35R21 vs 295/40R20+0.55%
- 295/35R21 vs 295/40R21+3.99%
- 295/35R21 vs 245/35R21-4.73%
- 295/35R21 vs 285/40R21+2.91%
- 295/35R21 vs 285/40R20-0.53%
Questions
Can I replace 295/35R21 with 265/45R21?
265/45R21 is outside the ±3% rule as a replacement for 295/35R21: the diameter differs by +4.32%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 295/35R21 and 265/45R21?
265/45R21 is 1.26" taller and 30 mm narrower; the sidewall is +0.63". At an indicated 60 mph you'd actually be doing 62.6 mph.
Will 265/45R21 fit on 295/35R21 wheels?
Both use a 21" rim, so the wheel diameter matches; check the wheel's width range for a 265 mm tire and the fender clearance.