305/30R19 tire size
305/30R19 is a metric size: 26.2" tall, 12.0" wide, on a 19" rim — about a 26x12.00R19. The sidewall is 3.6" and the tire turns 770 times per mile.
305/30R19 specs
| Overall diameter (height) | 26.20" · 666 mm |
|---|---|
| Section width | 12.01" · 305 mm |
| Sidewall height | 3.60" · 92 mm (30% of width) |
| Rim diameter | 19" |
| Circumference | 82.32" · 2.091 m |
| Revolutions per mile | 770 (478 per km) |
| Inch (flotation) equivalent | 26x12.00R19 |
Equivalent sizes on a 19" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 245/40R19 common | 26.72" | +1.95% | -60 mm | 61.2 mph | compare → |
| 235/40R19 common | 26.40" | +0.75% | -70 mm | 60.5 mph | compare → |
| 255/40R19 common | 27.03" | +3.16% | -50 mm | 61.9 mph | compare → |
| 255/35R19 common | 26.03" | -0.68% | -50 mm | 59.6 mph | compare → |
| 275/35R19 common | 26.58" | +1.43% | -30 mm | 60.9 mph | compare → |
| 245/35R19 common | 25.75" | -1.73% | -60 mm | 59.0 mph | compare → |
| 225/40R19 common | 26.09" | -0.45% | -80 mm | 59.7 mph | compare → |
| 235/35R19 common | 25.48" | -2.78% | -70 mm | 58.3 mph | compare → |
| 225/45R19 common | 26.97" | +2.93% | -80 mm | 61.8 mph | compare → |
| 285/35R19 common | 26.85" | +2.48% | -20 mm | 61.5 mph | compare → |
| 265/35R19 common | 26.30" | +0.38% | -40 mm | 60.2 mph | compare → |
| 235/45R19 common | 27.33" | +4.28% | -70 mm | 62.6 mph | compare → |
| 285/30R19 | 25.73" | -1.80% | -20 mm | 58.9 mph | compare → |
| 225/35R19 | 25.20" | -3.83% | -80 mm | 57.7 mph | compare → |
| 295/30R19 | 25.97" | -0.90% | -10 mm | 59.5 mph | compare → |
| 255/30R19 | 25.02" | -4.51% | -50 mm | 57.3 mph | compare → |
| 325/30R19 | 26.68" | +1.80% | +20 mm | 61.1 mph | compare → |
| 265/40R19 | 27.35" | +4.36% | -40 mm | 62.6 mph | compare → |
| 275/30R19 | 25.50" | -2.70% | -30 mm | 58.4 mph | compare → |
| 265/30R19 | 25.26" | -3.61% | -40 mm | 57.8 mph | compare → |
| 295/35R19 | 27.13" | +3.53% | -10 mm | 62.1 mph | compare → |
| 345/30R19 | 27.15" | +3.61% | +40 mm | 62.2 mph | compare → |
| 315/30R19 | 26.44" | +0.90% | +10 mm | 60.5 mph | compare → |
| 305/35R19 | 27.41" | +4.58% | 0 mm | 62.7 mph | calculate → |
| 355/30R19 | 27.39" | +4.51% | +50 mm | 62.7 mph | calculate → |
| 215/50R19 | 27.46" | +4.81% | -90 mm | 62.9 mph | calculate → |
| 195/50R19 | 26.68" | +1.80% | -110 mm | 61.1 mph | calculate → |
| 315/25R19 | 25.20" | -3.83% | +10 mm | 57.7 mph | calculate → |
| 175/60R19 | 27.27" | +4.06% | -130 mm | 62.4 mph | calculate → |
| 335/30R19 | 26.91" | +2.70% | +30 mm | 61.6 mph | calculate → |
| 215/35R19 | 24.93" | -4.88% | -90 mm | 57.1 mph | calculate → |
Plus / minus sizing: 18" and 20" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 225/45R18 common | 25.97" | -0.89% | -80 mm | 59.5 mph | compare → |
| 235/45R18 common | 26.33" | +0.47% | -70 mm | 60.3 mph | compare → |
| 255/40R18 common | 26.03" | -0.66% | -50 mm | 59.6 mph | compare → |
| 265/40R18 | 26.35" | +0.54% | -40 mm | 60.3 mph | compare → |
| 265/30R20 | 26.26" | +0.21% | -40 mm | 60.1 mph | compare → |
| 255/30R20 | 26.02" | -0.69% | -50 mm | 59.6 mph | compare → |
| 225/35R20 | 26.20" | -0.02% | -80 mm | 60.0 mph | compare → |
| 295/35R18 | 26.13" | -0.29% | -10 mm | 59.8 mph | compare → |
| 215/50R18 | 26.46" | +0.99% | -90 mm | 60.6 mph | compare → |
| 305/25R20 | 26.00" | -0.77% | 0 mm | 59.5 mph | compare → |
| 325/25R20 | 26.40" | +0.74% | +20 mm | 60.4 mph | calculate → |
| 305/35R18 | 26.41" | +0.77% | 0 mm | 60.5 mph | calculate → |
| 26x12.00R18 | 26.00" | -0.78% | 0 mm | 59.5 mph | calculate → |
| 26x6.00R18 | 26.00" | -0.78% | -153 mm | 59.5 mph | calculate → |
| 26x8.00R18 | 26.00" | -0.78% | -102 mm | 59.5 mph | calculate → |
| 145/70R18 | 25.99" | -0.81% | -160 mm | 59.5 mph | calculate → |
| 315/25R20 | 26.20" | -0.02% | +10 mm | 60.0 mph | calculate → |
| 345/30R18 | 26.15" | -0.21% | +40 mm | 59.9 mph | calculate → |
Try another size against 305/30R19
Questions
What size is 305/30R19 in inches?
305/30R19 is about 26.2" tall and 12.0" wide on a 19-inch rim — roughly a 26x12.00R19 in inch sizing.
What does 305/30R19 mean?
305 mm section width, sidewall 30% of the width (3.60"), radial construction, 19-inch rim.
What tire sizes are equivalent to 305/30R19?
On the same 19" rim, within 3% of the diameter: 265/35R19 (+0.38%), 225/40R19 (-0.45%), 255/35R19 (-0.68%), 235/40R19 (+0.75%), 295/30R19 (-0.90%), 315/30R19 (+0.90%).
How many revolutions per mile does a 305/30R19 tire make?
About 770 revolutions per mile (circumference 82.3").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.