What is 235/75R15 in inches?

A 235/75R15 tire is 28.88 inches tall and 9.3 inches wide, with a 6.94-inch sidewall, mounted on a 15-inch wheel. In metric that is 733 mm tall and 235 mm wide. The circumference is 90.72 inches.

How tall is a 235/75R15 tire?

28.88 inches, or 733 mm. That is the overall diameter, wheel included. It turns about 698 times per mile, which is what your speedometer counts.

What do the numbers in 235/75R15 mean?

235 is the tread width in millimeters, 75 is the aspect ratio — the sidewall height as a percentage of the tread width — and 15 is the wheel diameter in inches. So the sidewall is 235 × 75% = 176.3 mm tall.

235/75R15

A 235/75R15 tire is 28.88 inches tall and 9.3 inches wide, with a 6.94-inch sidewall, mounted on a 15-inch wheel.

Overall diameter

28.88″

733 mm

Sidewall height

6.94″

176.3 mm

Tread width

235 mm

9.3″

Circumference

90.72″

7.6 ft

Revs per mile

698

434 per km

Wheel diameter

15″

aspect ratio 75%

Compare vs 195/65R15 Compare with a custom size

Cross-section

Overall diameter: 28.88″
Sidewall (each side): 6.94″
Wheel: 15″

235/75R15 in inches and millimeters

Every dimension of a 235/75R15, converted both ways. Calculated from the size code, accurate to about 1%.

Measurement	Inches	Millimeters
Overall diameter (height)	28.88″	733 mm
Tread width	9.3″	235 mm
Sidewall height	6.94″	176.3 mm
Wheel diameter	15″	381 mm
Circumference	90.72″	2304 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.

235/75R15 compared with other sizes

All 20 practical swaps involving 235/75R15 — diameter change, speedometer impact and a fit verdict for each.

265/70R15 → 235/75R15

265/70R15

Diameter +2.5% · This fits

235/70R16 → 235/75R15

235/70R16

Diameter +0.3% · This fits

235/65R17 → 235/75R15

235/65R17

Diameter +0.5% · This fits

225/65R17 → 235/75R15

225/65R17

Diameter −1.3% · This fits

225/75R16 → 235/75R15

225/75R16

Diameter +1.4% · This fits

235/60R17 → 235/75R15

235/60R17

Diameter −2.7% · This fits

225/70R16 → 235/75R15

225/70R16

Diameter −1.6% · This fits

245/70R16 → 235/75R15

245/70R16

Diameter +2.2% · This fits

245/65R17 → 235/75R15

245/65R17

Diameter +2.3% · This fits

215/65R17 → 235/75R15

215/65R17

Diameter −3.0% · Borderline. Check clearance first

215/70R16 → 235/75R15

215/70R16

Diameter −3.6% · Borderline. Check clearance first

255/65R17 → 235/75R15

255/65R17

Diameter +4.1% · Borderline. Check clearance first

255/70R16 → 235/75R15

255/70R16

Diameter +4.1% · Borderline. Check clearance first

225/60R17 → 235/75R15

225/60R17

Diameter −4.3% · Borderline. Check clearance first

235/75R15 → 265/70R15

265/70R15

Diameter −2.5% · This fits

235/75R15 → 225/70R16

225/70R16

Diameter +1.7% · This fits

235/75R15 → 235/70R16

235/70R16

Diameter −0.3% · This fits

235/75R15 → 225/65R17

225/65R17

Diameter +1.3% · This fits

235/75R15 → 235/65R17

235/65R17

Diameter −0.5% · This fits

235/75R15 → 195/65R15

195/65R15

Diameter +15.6% · Too big a jump

Common questions

What is 235/75R15 in inches?: A 235/75R15 tire is 28.88 inches tall and 9.3 inches wide, with a 6.94-inch sidewall, mounted on a 15-inch wheel. In metric that is 733 mm tall and 235 mm wide. The circumference is 90.72 inches.
How tall is a 235/75R15 tire?: 28.88 inches, or 733 mm. That is the overall diameter, wheel included. It turns about 698 times per mile, which is what your speedometer counts.
What do the numbers in 235/75R15 mean?: 235 is the tread width in millimeters, 75 is the aspect ratio — the sidewall height as a percentage of the tread width — and 15 is the wheel diameter in inches. So the sidewall is 235 × 75% = 176.3 mm tall.