285/30R22 vs 285/35R21
285/35R21 is a safe swap for 285/30R22 by the usual ±3% rule: the diameter differs by +0.42%.
Speedometer and odometer
With 285/35R21 on a car calibrated for 285/30R22, the speedometer reads 59.7 mph when you're really doing 60, and the odometer under-counts by 0.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.2 mph |
| 60 mph | 60.3 mph |
| 70 mph | 70.3 mph |
| 80 mph | 80.3 mph |
Other sizes close to 285/30R22
- 285/30R22 vs 275/35R21-0.53%
- 285/30R22 vs 265/35R22+1.99%
- 285/30R22 vs 285/35R22+3.91%
- 285/30R22 vs 325/30R21-0.19%
- 285/30R22 vs 245/40R21-0.05%
- 285/30R22 vs 275/35R22+2.95%
- 285/30R22 vs 295/35R22+4.86%
- 285/30R22 vs 295/30R22+0.82%
- 285/30R22 vs 315/30R22+2.47%
- 285/30R22 vs 255/40R22+4.52%
- 285/30R22 vs 265/30R22-1.64%
- 285/30R22 vs 255/30R22-2.47%
Questions
Can I replace 285/30R22 with 285/35R21?
285/35R21 is a safe swap for 285/30R22 by the usual ±3% rule: the diameter differs by +0.42%.
What's the difference between 285/30R22 and 285/35R21?
285/35R21 is 0.12" taller and 0 mm wider; the sidewall is +0.56". At an indicated 60 mph you'd actually be doing 60.3 mph.
Will 285/35R21 fit on 285/30R22 wheels?
No — 285/30R22 needs a 22" wheel and 285/35R21 a 21" wheel. This is a plus/minus-size swap that changes wheels too.