285/70R17 vs 305/70R16
305/70R16 is a safe swap for 285/70R17 by the usual ±3% rule: the diameter differs by +0.31%.
Speedometer and odometer
With 305/70R16 on a car calibrated for 285/70R17, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.1 mph |
| 60 mph | 60.2 mph |
| 70 mph | 70.2 mph |
| 80 mph | 80.3 mph |
Other sizes close to 285/70R17
- 285/70R17 vs 265/70R17-3.37%
- 285/70R17 vs 245/75R17-3.79%
- 285/70R17 vs 265/70R18-0.31%
- 285/70R17 vs 235/80R17-2.77%
- 285/70R17 vs 285/75R16+0.37%
- 285/70R17 vs 285/65R18-0.37%
- 285/70R17 vs 255/75R17-1.99%
- 285/70R17 vs 295/70R17+1.69%
- 285/70R17 vs 33x12.50R18+0.89%
- 285/70R17 vs 285/75R17+3.43%
- 285/70R17 vs 33x12.50R17+0.89%
- 285/70R17 vs 275/70R17-1.69%
Questions
Can I replace 285/70R17 with 305/70R16?
305/70R16 is a safe swap for 285/70R17 by the usual ±3% rule: the diameter differs by +0.31%.
What's the difference between 285/70R17 and 305/70R16?
305/70R16 is 0.10" taller and 20 mm wider; the sidewall is +0.55". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 305/70R16 fit on 285/70R17 wheels?
No — 285/70R17 needs a 17" wheel and 305/70R16 a 16" wheel. This is a plus/minus-size swap that changes wheels too.