305/65R17 vs 305/70R16
305/70R16 is a safe swap for 305/65R17 by the usual ±3% rule: the diameter differs by +0.62%.
Speedometer and odometer
With 305/70R16 on a car calibrated for 305/65R17, the speedometer reads 59.6 mph when you're really doing 60, and the odometer under-counts by 0.6%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.2 mph |
| 45 mph | 45.3 mph |
| 60 mph | 60.4 mph |
| 70 mph | 70.4 mph |
| 80 mph | 80.5 mph |
Other sizes close to 305/65R17
- 305/65R17 vs 265/70R17-3.08%
- 305/65R17 vs 285/70R17+0.30%
- 305/65R17 vs 245/75R17-3.50%
- 305/65R17 vs 265/70R18-0.01%
- 305/65R17 vs 235/80R17-2.47%
- 305/65R17 vs 285/75R16+0.68%
- 305/65R17 vs 285/65R18-0.07%
- 305/65R17 vs 255/70R17-4.77%
- 305/65R17 vs 255/75R17-1.69%
- 305/65R17 vs 295/70R17+1.99%
- 305/65R17 vs 285/75R17+3.74%
- 305/65R17 vs 33x12.50R17+1.20%
Questions
Can I replace 305/65R17 with 305/70R16?
305/70R16 is a safe swap for 305/65R17 by the usual ±3% rule: the diameter differs by +0.62%.
What's the difference between 305/65R17 and 305/70R16?
305/70R16 is 0.20" taller and 0 mm wider; the sidewall is +0.60". At an indicated 60 mph you'd actually be doing 60.4 mph.
Will 305/70R16 fit on 305/65R17 wheels?
No — 305/65R17 needs a 17" wheel and 305/70R16 a 16" wheel. This is a plus/minus-size swap that changes wheels too.