235/50R19 vs 295/30R21
295/30R21 is 0.28 in (7.2 mm) shorter than 235/50R19, a −1.00% diameter difference. With the speedometer set for 235/50R19, an indicated 60 mph is 59.4 mph on 295/30R21.
Is this a safe swap?
Diameter difference −1.00%: within the ±3% guideline
By overall diameter alone, 295/30R21 falls inside the ±3% range commonly used as a guideline when replacing 235/50R19. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.
| Measurement | 235/50R19 | 295/30R21 | Difference | % diff |
|---|---|---|---|---|
| Overall diameter | 28.25 in (717.6 mm) | 27.97 in (710.4 mm) | −0.28 in (−7.2 mm) | −1.00% |
| Sidewall height | 4.63 in (117.5 mm) | 3.48 in (88.5 mm) | −1.14 in (−29.0 mm) | −24.68% |
| Section width | 9.25 in (235.0 mm) | 11.61 in (295.0 mm) | +2.36 in (+60.0 mm) | +25.53% |
| Circumference | 88.76 in (2,254.4 mm) | 87.87 in (2,231.8 mm) | −0.89 in (−22.6 mm) | −1.00% |
| Revolutions per mile | 714 | 721 | +7 | +1.01% |
| Indicated | Actual on 235/50R19 | Actual on 295/30R21 | Difference |
|---|---|---|---|
| 30 mph | 30.0 mph | 29.7 mph | −0.3 mph |
| 60 mph | 60.0 mph | 59.4 mph | −0.6 mph |
| 75 mph | 75.0 mph | 74.2 mph | −0.8 mph |
Ride-height change: 295/30R21 lowers the vehicle by 0.14 in (3.6 mm) at the axle (half the −7.2 mm diameter difference).
295/30R21 is 0.28 in shorter than 235/50R19 and 60 mm wider, a 1.00% difference in overall diameter.
With the speedometer calibrated for 235/50R19, an indicated 60 mph is actually 59.4 mph on 295/30R21, and revolutions per mile change from 714 to 721.
295/30R21 mounts on a 21-inch wheel, a plus-2 fitment from the 19-inch wheel of 235/50R19.
Size pages
Other comparisons with 235/50R19
- 215/65R17 vs 235/50R19
- 235/60R17 vs 235/50R19
- 225/65R17 vs 235/50R19
- 255/50R18 vs 235/50R19
- 285/45R18 vs 235/50R19
- 235/55R18 vs 235/50R19
- 265/50R18 vs 235/50R19
- 235/45R19 vs 235/50R19
Other comparisons with 295/30R21
- 245/45R19 vs 295/30R21
- 225/50R19 vs 295/30R21
- 285/40R19 vs 295/30R21
- 255/45R19 vs 295/30R21
- 245/40R20 vs 295/30R21
- 285/35R20 vs 295/30R21
- 255/40R20 vs 295/30R21
- 295/35R20 vs 295/30R21
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.