Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-21 | 235/50-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.91 (835.9) | 30.25 (768.4) | -2.66 (-67.5) -8.1% |
| Width inches (mm) | 10.83 (275) | 9.25 (235) | -1.57 (-40) -14.5% |
| Circum. inches (mm) | 103.39 (2626.06) | 95.04 (2414) | -8.35 (-212.06) -8.1% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 4.63 (117.5) | -1.33 (-33.75) -22.3% |
| Revolutions per mile (km) | 612.84 (380.8) | 666.67 (414.25) | 53.83 (33.45) 8.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.38 mph (29.59 km/h) |
| 25 mph (40.23 km/h) | 22.98 mph (36.98 km/h) |
| 30 mph (48.28 km/h) | 27.58 mph (44.38 km/h) |
| 35 mph (56.33 km/h) | 32.17 mph (51.78 km/h) |
| 40 mph (64.37 km/h) | 36.77 mph (59.18 km/h) |
| 45 mph (72.42 km/h) | 41.37 mph (66.57 km/h) |
| 50 mph (80.47 km/h) | 45.96 mph (73.97 km/h) |
| 55 mph (88.51 km/h) | 50.56 mph (81.37 km/h) |
| 60 mph (96.56 km/h) | 55.15 mph (88.76 km/h) |
| 65 mph (104.61 km/h) | 59.75 mph (96.16 km/h) |
| 70 mph (112.65 km/h) | 64.35 mph (103.56 km/h) |
| 75 mph (120.7 km/h) | 68.94 mph (110.95 km/h) |
| 80 mph (128.75 km/h) | 73.54 mph (118.35 km/h) |
| 85 mph (136.79 km/h) | 78.14 mph (125.75 km/h) |
| 90 mph (144.84 km/h) | 82.73 mph (133.15 km/h) |
| 95 mph (152.89 km/h) | 87.33 mph (140.54 km/h) |
| 100 mph (160.93 km/h) | 91.92 mph (147.94 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1697 | 1971 | 2122 | 2216 | 2317 | 2390 | 2469 | 2563 | 2693 | 2823 | 2967 | 3083 | 3292 | 3523 | 3704 | 3819 | 3884 | 4122 | 4454 | 5176 |
Better Fuel Economy Factory Ratios Increased Power
