What is 245/40R19 in inches?

A 245/40R19 tire is 26.72 inches tall and 9.6 inches wide, with a 3.86-inch sidewall, mounted on a 19-inch wheel. In metric that is 679 mm tall and 245 mm wide. The circumference is 83.93 inches.

How tall is a 245/40R19 tire?

26.72 inches, or 679 mm. That is the overall diameter, wheel included. It turns about 755 times per mile, which is what your speedometer counts.

What do the numbers in 245/40R19 mean?

245 is the tread width in millimeters, 40 is the aspect ratio — the sidewall height as a percentage of the tread width — and 19 is the wheel diameter in inches. So the sidewall is 245 × 40% = 98.0 mm tall.

245/40R19

Most common 19″ size

A 245/40R19 tire is 26.72 inches tall and 9.6 inches wide, with a 3.86-inch sidewall, mounted on a 19-inch wheel.

Common fitments: Model 3, Model Y, Camry XSE

Overall diameter

26.72″

679 mm

Sidewall height

3.86″

98.0 mm

Tread width

245 mm

9.6″

Circumference

83.93″

7.0 ft

Revs per mile

755

469 per km

Wheel diameter

19″

aspect ratio 40%

Compare 245/40R19 in the tool Compare with a custom size

Cross-section

Overall diameter: 26.72″
Sidewall (each side): 3.86″
Wheel: 19″

245/40R19 in inches and millimeters

Every dimension of a 245/40R19, converted both ways. Calculated from the size code, accurate to about 1%.

Measurement	Inches	Millimeters
Overall diameter (height)	26.72″	679 mm
Tread width	9.6″	245 mm
Sidewall height	3.86″	98.0 mm
Wheel diameter	19″	483 mm
Circumference	83.93″	2132 mm

Nominal dimensions from the size code. A real tire varies by a few millimeters between manufacturers, and a loaded tire sits slightly shorter than its free diameter.

245/40R19 compared with other sizes

All 37 practical swaps involving 245/40R19 — diameter change, speedometer impact and a fit verdict for each.

245/40R19 → 225/55R17

225/55R17

Diameter −0.1% · This fits

245/40R19 → 245/45R18

245/45R18

Diameter +0.1% · This fits

245/40R19 → 235/40R19

235/40R19

Diameter +1.2% · This fits

245/40R19 → 245/35R19

245/35R19

Diameter +3.7% · Borderline. Check clearance first

235/40R19 → 245/40R19

235/40R19

Diameter −1.2% · This fits

255/40R19 → 245/40R19

255/40R19

Diameter +1.2% · This fits

235/45R19 → 245/40R19

235/45R19

Diameter +2.3% · This fits

245/35R19 → 245/40R19

245/35R19

Diameter −3.6% · Borderline. Check clearance first

245/45R19 → 245/40R19

245/45R19

Diameter +3.6% · Borderline. Check clearance first

255/35R19 → 245/40R19

255/35R19

Diameter −2.6% · This fits

275/40R19 → 245/40R19

275/40R19

Diameter +3.5% · Borderline. Check clearance first

245/45R18 → 245/40R19

245/45R18

Diameter −0.1% · This fits

245/35R20 → 245/40R19

245/35R20

Diameter +0.1% · This fits

255/45R19 → 245/40R19

255/45R19

Diameter +4.9% · Borderline. Check clearance first

225/55R17 → 245/40R19

225/55R17

Diameter +0.1% · This fits

255/35R20 → 245/40R19

255/35R20

Diameter +1.2% · This fits

255/45R18 → 245/40R19

255/45R18

Diameter +1.2% · This fits

235/45R18 → 245/40R19

235/45R18

Diameter −1.5% · This fits

245/40R19 → 245/45R19

245/45R19

Diameter −3.5% · Borderline. Check clearance first

245/40R19 → 255/35R19

255/35R19

Diameter +2.6% · This fits

245/40R19 → 255/40R19

255/40R19

Diameter −1.2% · This fits

245/40R19 → 275/40R19

275/40R19

Diameter −3.4% · Borderline. Check clearance first

245/40R19 → 245/35R20

245/35R20

Diameter −0.1% · This fits

245/40R19 → 255/35R20

255/35R20

Diameter −1.2% · This fits

245/40R19 → 235/45R19

235/45R19

Diameter −2.2% · This fits

245/40R19 → 235/50R19

235/50R19

Diameter −5.4% · Too big a jump

245/40R19 → 255/45R19

255/45R19

Diameter −4.7% · Borderline. Check clearance first

245/40R19 → 265/35R20

265/35R20

Diameter −2.1% · This fits

265/50R19 → 245/40R19

265/50R19

Diameter +10.2% · Too big a jump

235/50R19 → 245/40R19

235/50R19

Diameter +5.7% · Too big a jump

235/55R19 → 245/40R19

235/55R19

Diameter +9.2% · Too big a jump

245/55R19 → 245/40R19

245/55R19

Diameter +10.8% · Too big a jump

255/50R19 → 245/40R19

255/50R19

Diameter +8.7% · Too big a jump

255/60R19 → 245/40R19

255/60R19

Diameter +16.2% · Too big a jump

265/55R19 → 245/40R19

265/55R19

Diameter +14.1% · Too big a jump

275/55R19 → 245/40R19

275/55R19

Diameter +15.7% · Too big a jump

245/40R19 → 235/45R18

235/45R18

Diameter +1.5% · This fits

Common questions

What is 245/40R19 in inches?: A 245/40R19 tire is 26.72 inches tall and 9.6 inches wide, with a 3.86-inch sidewall, mounted on a 19-inch wheel. In metric that is 679 mm tall and 245 mm wide. The circumference is 83.93 inches.
How tall is a 245/40R19 tire?: 26.72 inches, or 679 mm. That is the overall diameter, wheel included. It turns about 755 times per mile, which is what your speedometer counts.
What do the numbers in 245/40R19 mean?: 245 is the tread width in millimeters, 40 is the aspect ratio — the sidewall height as a percentage of the tread width — and 19 is the wheel diameter in inches. So the sidewall is 245 × 40% = 98.0 mm tall.