225/35R20 vs 275/30R20
275/30R20 is a safe swap for 225/35R20 by the usual ±3% rule: the diameter differs by +1.13%.
Speedometer and odometer
With 275/30R20 on a car calibrated for 225/35R20, the speedometer reads 59.3 mph when you're really doing 60, and the odometer under-counts by 1.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.3 mph |
| 45 mph | 45.5 mph |
| 60 mph | 60.7 mph |
| 70 mph | 70.8 mph |
| 80 mph | 80.9 mph |
Other sizes close to 225/35R20
- 225/35R20 vs 235/40R19+0.77%
- 225/35R20 vs 255/35R19-0.66%
- 225/35R20 vs 245/35R20+2.10%
- 225/35R20 vs 255/35R20+3.16%
- 225/35R20 vs 225/40R19-0.44%
- 225/35R20 vs 265/35R19+0.39%
- 225/35R20 vs 285/30R20+2.03%
- 225/35R20 vs 265/35R20+4.21%
- 225/35R20 vs 235/35R20+1.05%
- 225/35R20 vs 295/30R20+2.93%
- 225/35R20 vs 305/30R20+3.83%
- 225/35R20 vs 305/30R19+0.02%
Questions
Can I replace 225/35R20 with 275/30R20?
275/30R20 is a safe swap for 225/35R20 by the usual ±3% rule: the diameter differs by +1.13%.
What's the difference between 225/35R20 and 275/30R20?
275/30R20 is 0.30" taller and 50 mm wider; the sidewall is +0.15". At an indicated 60 mph you'd actually be doing 60.7 mph.
Will 275/30R20 fit on 225/35R20 wheels?
Both use a 20" rim, so the wheel diameter matches; check the wheel's width range for a 275 mm tire and the fender clearance.