245/65R17 vs 235/55R19
235/55R19 is 0.36 in (9.2 mm) shorter than 245/65R17, a −1.23% diameter difference. With the speedometer set for 245/65R17, an indicated 60 mph is 59.3 mph on 235/55R19.
Is this a safe swap?
Diameter difference −1.23%: within the ±3% guideline
By overall diameter alone, 235/55R19 falls inside the ±3% range commonly used as a guideline when replacing 245/65R17. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.
| Measurement | 245/65R17 | 235/55R19 | Difference | % diff |
|---|---|---|---|---|
| Overall diameter | 29.54 in (750.3 mm) | 29.18 in (741.1 mm) | −0.36 in (−9.2 mm) | −1.23% |
| Sidewall height | 6.27 in (159.3 mm) | 5.09 in (129.3 mm) | −1.18 in (−30.0 mm) | −18.84% |
| Section width | 9.65 in (245.0 mm) | 9.25 in (235.0 mm) | −0.39 in (−10.0 mm) | −4.08% |
| Circumference | 92.80 in (2,357.1 mm) | 91.66 in (2,328.2 mm) | −1.14 in (−28.9 mm) | −1.23% |
| Revolutions per mile | 683 | 691 | +8 | +1.24% |
| Indicated | Actual on 245/65R17 | Actual on 235/55R19 | Difference |
|---|---|---|---|
| 30 mph | 30.0 mph | 29.6 mph | −0.4 mph |
| 60 mph | 60.0 mph | 59.3 mph | −0.7 mph |
| 75 mph | 75.0 mph | 74.1 mph | −0.9 mph |
Ride-height change: 235/55R19 lowers the vehicle by 0.18 in (4.6 mm) at the axle (half the −9.2 mm diameter difference).
235/55R19 is 0.36 in shorter than 245/65R17 and 10 mm narrower, a 1.23% difference in overall diameter.
With the speedometer calibrated for 245/65R17, an indicated 60 mph is actually 59.3 mph on 235/55R19, and revolutions per mile change from 683 to 691.
235/55R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 245/65R17.
Size pages
Other comparisons with 245/65R17
- 255/70R15 vs 245/65R17
- 245/75R15 vs 245/65R17
- 265/70R15 vs 245/65R17
- 30x9.50R15 vs 245/65R17
- 225/75R16 vs 245/65R17
- 245/70R16 vs 245/65R17
- 235/75R16 vs 245/65R17
- 225/65R17 vs 245/65R17
Other comparisons with 235/55R19
- 235/65R17 vs 235/55R19
- 255/60R17 vs 235/55R19
- 265/60R17 vs 235/55R19
- 255/55R18 vs 235/55R19
- 235/60R18 vs 235/55R19
- 235/50R19 vs 235/55R19
- 225/55R19 vs 235/55R19
- 255/50R19 vs 235/55R19
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.