255/35R18 vs 225/35R19
225/35R19 is a safe swap for 255/35R18 by the usual ±3% rule: the diameter differs by +0.69%.
Speedometer and odometer
With 225/35R19 on a car calibrated for 255/35R18, the speedometer reads 59.6 mph when you're really doing 60, and the odometer under-counts by 0.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.2 mph |
| 45 mph | 45.3 mph |
| 60 mph | 60.4 mph |
| 70 mph | 70.5 mph |
| 80 mph | 80.6 mph |
Other sizes close to 255/35R18
- 255/35R18 vs 225/45R17-0.22%
- 255/35R18 vs 245/40R18+2.75%
- 255/35R18 vs 225/45R18+3.78%
- 255/35R18 vs 225/40R18+0.24%
- 255/35R18 vs 205/50R17+0.17%
- 255/35R18 vs 235/40R18+1.49%
- 255/35R18 vs 255/40R18+4.01%
- 255/35R18 vs 275/35R18+2.20%
- 255/35R18 vs 265/35R18+1.10%
- 255/35R18 vs 255/40R17+0.02%
- 255/35R18 vs 215/45R18+2.36%
- 255/35R18 vs 245/35R18-1.10%
Questions
Can I replace 255/35R18 with 225/35R19?
225/35R19 is a safe swap for 255/35R18 by the usual ±3% rule: the diameter differs by +0.69%.
What's the difference between 255/35R18 and 225/35R19?
225/35R19 is 0.17" taller and 30 mm narrower; the sidewall is -0.41". At an indicated 60 mph you'd actually be doing 60.4 mph.
Will 225/35R19 fit on 255/35R18 wheels?
No — 255/35R18 needs a 18" wheel and 225/35R19 a 19" wheel. This is a plus/minus-size swap that changes wheels too.