What is 235/80R17 in inches?

A 235/80R17 tire is 31.80 inches tall and 9.3 inches wide, with a 7.40-inch sidewall, mounted on a 17-inch wheel. In metric that is 808 mm tall and 235 mm wide. The circumference is 99.91 inches.

How tall is a 235/80R17 tire?

31.80 inches, or 808 mm. That is the overall diameter, wheel included. It turns about 634 times per mile, which is what your speedometer counts.

What do the numbers in 235/80R17 mean?

235 is the tread width in millimeters, 80 is the aspect ratio — the sidewall height as a percentage of the tread width — and 17 is the wheel diameter in inches. So the sidewall is 235 × 80% = 188.0 mm tall.

235/80R17

A 235/80R17 tire is 31.80 inches tall and 9.3 inches wide, with a 7.40-inch sidewall, mounted on a 17-inch wheel.

Overall diameter

31.80″

808 mm

Sidewall height

7.40″

188.0 mm

Tread width

235 mm

9.3″

Circumference

99.91″

8.3 ft

Revs per mile

634

394 per km

Wheel diameter

17″

aspect ratio 80%

Compare vs 225/45R17 Compare with a custom size

Cross-section

Overall diameter: 31.80″
Sidewall (each side): 7.40″
Wheel: 17″

235/80R17 in inches and millimeters

Every dimension of a 235/80R17, converted both ways. Calculated from the size code, accurate to about 1%.

Measurement	Inches	Millimeters
Overall diameter (height)	31.80″	808 mm
Tread width	9.3″	235 mm
Sidewall height	7.40″	188.0 mm
Wheel diameter	17″	432 mm
Circumference	99.91″	2538 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.

235/80R17 compared with other sizes

All 24 practical swaps involving 235/80R17 — diameter change, speedometer impact and a fit verdict for each.

235/80R17 → 265/70R17

265/70R17

Diameter +0.6% · This fits

235/80R17 → 265/75R16

265/75R16

Diameter +0.5% · This fits

265/70R17 → 235/80R17

265/70R17

Diameter −0.6% · This fits

255/75R17 → 235/80R17

255/75R17

Diameter +0.8% · This fits

245/75R17 → 235/80R17

245/75R17

Diameter −1.1% · This fits

275/70R17 → 235/80R17

275/70R17

Diameter +1.1% · This fits

275/65R17 → 235/80R17

275/65R17

Diameter −2.3% · This fits

255/70R17 → 235/80R17

255/70R17

Diameter −2.4% · This fits

265/65R17 → 235/80R17

265/65R17

Diameter −3.9% · Borderline. Check clearance first

245/70R17 → 235/80R17

245/70R17

Diameter −4.1% · Borderline. Check clearance first

265/75R16 → 235/80R17

265/75R16

Diameter −0.5% · This fits

265/65R18 → 235/80R17

265/65R18

Diameter −0.8% · This fits

255/70R18 → 235/80R17

255/70R18

Diameter +0.8% · This fits

275/65R18 → 235/80R17

275/65R18

Diameter +0.9% · This fits

255/65R18 → 235/80R17

255/65R18

Diameter −2.4% · This fits

255/60R19 → 235/80R17

255/60R19

Diameter −2.4% · This fits

235/80R17 → 245/70R17

245/70R17

Diameter +4.3% · Borderline. Check clearance first

235/80R17 → 245/75R17

245/75R17

Diameter +1.1% · This fits

235/80R17 → 255/70R17

255/70R17

Diameter +2.4% · This fits

235/80R17 → 255/75R17

255/75R17

Diameter −0.8% · This fits

235/80R17 → 265/65R17

265/65R17

Diameter +4.1% · Borderline. Check clearance first

235/80R17 → 275/65R17

275/65R17

Diameter +2.3% · This fits

235/80R17 → 275/70R17

275/70R17

Diameter −1.1% · This fits

235/80R17 → 225/45R17

225/45R17

Diameter +27.4% · Too big a jump

Common questions

What is 235/80R17 in inches?: A 235/80R17 tire is 31.80 inches tall and 9.3 inches wide, with a 7.40-inch sidewall, mounted on a 17-inch wheel. In metric that is 808 mm tall and 235 mm wide. The circumference is 99.91 inches.
How tall is a 235/80R17 tire?: 31.80 inches, or 808 mm. That is the overall diameter, wheel included. It turns about 634 times per mile, which is what your speedometer counts.
What do the numbers in 235/80R17 mean?: 235 is the tread width in millimeters, 80 is the aspect ratio — the sidewall height as a percentage of the tread width — and 17 is the wheel diameter in inches. So the sidewall is 235 × 80% = 188.0 mm tall.