245/35R20 vs 285/35R19
285/35R19 is a safe swap for 245/35R20 by the usual ±3% rule: the diameter differs by +0.38%.
Speedometer and odometer
With 285/35R19 on a car calibrated for 245/35R20, the speedometer reads 59.8 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 | 60.2 mph |
| 70 mph | 70.3 mph |
| 80 mph | 80.3 mph |
Other sizes close to 245/35R20
- 245/35R20 vs 245/40R19-0.13%
- 245/35R20 vs 245/40R20+3.61%
- 245/35R20 vs 275/35R19-0.65%
- 245/35R20 vs 255/35R20+1.03%
- 245/35R20 vs 275/35R20+3.09%
- 245/35R20 vs 255/40R20+4.78%
- 245/35R20 vs 225/45R19+0.82%
- 245/35R20 vs 285/35R20+4.12%
- 245/35R20 vs 285/30R20-0.07%
- 245/35R20 vs 275/30R20-0.96%
- 245/35R20 vs 265/35R20+2.06%
- 245/35R20 vs 235/35R20-1.03%
Questions
Can I replace 245/35R20 with 285/35R19?
285/35R19 is a safe swap for 245/35R20 by the usual ±3% rule: the diameter differs by +0.38%.
What's the difference between 245/35R20 and 285/35R19?
285/35R19 is 0.10" taller and 40 mm wider; the sidewall is +0.55". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 285/35R19 fit on 245/35R20 wheels?
No — 245/35R20 needs a 20" wheel and 285/35R19 a 19" wheel. This is a plus/minus-size swap that changes wheels too.