235/85R16 vs 235/80R17
235/80R17 is a safe swap for 235/85R16 by the usual ±3% rule: the diameter differs by +0.24%.
Speedometer and odometer
With 235/80R17 on a car calibrated for 235/85R16, the speedometer reads 59.9 mph when you're really doing 60, and the odometer under-counts by 0.2%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.1 mph |
| 60 mph | 60.1 mph |
| 70 mph | 70.2 mph |
| 80 mph | 80.2 mph |
Other sizes close to 235/85R16
- 235/85R16 vs 265/70R17-0.38%
- 235/85R16 vs 265/75R16-0.25%
- 235/85R16 vs 245/75R16-3.97%
- 235/85R16 vs 245/75R17-0.82%
- 235/85R16 vs 265/70R16-3.54%
- 235/85R16 vs 285/75R16+3.47%
- 235/85R16 vs 215/85R16-4.22%
- 235/85R16 vs 305/70R16+3.41%
- 235/85R16 vs 32x11.50R15+0.86%
- 235/85R16 vs 275/70R16-1.80%
- 235/85R16 vs 255/85R16+4.22%
Questions
Can I replace 235/85R16 with 235/80R17?
235/80R17 is a safe swap for 235/85R16 by the usual ±3% rule: the diameter differs by +0.24%.
What's the difference between 235/85R16 and 235/80R17?
235/80R17 is 0.07" taller and 0 mm wider; the sidewall is -0.46". At an indicated 60 mph you'd actually be doing 60.1 mph.
Will 235/80R17 fit on 235/85R16 wheels?
No — 235/85R16 needs a 16" wheel and 235/80R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.