What is 275/55R20 in inches?

A 275/55R20 tire is 31.91 inches tall and 10.8 inches wide, with a 5.95-inch sidewall, mounted on a 20-inch wheel. In metric that is 810 mm tall and 275 mm wide. The circumference is 100.25 inches.

How tall is a 275/55R20 tire?

31.91 inches, or 810 mm. That is the overall diameter, wheel included. It turns about 632 times per mile, which is what your speedometer counts.

What do the numbers in 275/55R20 mean?

275 is the tread width in millimeters, 55 is the aspect ratio — the sidewall height as a percentage of the tread width — and 20 is the wheel diameter in inches. So the sidewall is 275 × 55% = 151.3 mm tall.

275/55R20

Most common 20″ size

A 275/55R20 tire is 31.91 inches tall and 10.8 inches wide, with a 5.95-inch sidewall, mounted on a 20-inch wheel.

Common fitments: F-150, Silverado, Yukon

Overall diameter

31.91″

810 mm

Sidewall height

5.95″

151.3 mm

Tread width

275 mm

10.8″

Circumference

100.25″

8.4 ft

Revs per mile

632

393 per km

Wheel diameter

20″

aspect ratio 55%

Compare 275/55R20 in the tool Compare with a custom size

Cross-section

Overall diameter: 31.91″
Sidewall (each side): 5.95″
Wheel: 20″

275/55R20 in inches and millimeters

Every dimension of a 275/55R20, converted both ways. Calculated from the size code, accurate to about 1%.

Measurement	Inches	Millimeters
Overall diameter (height)	31.91″	810 mm
Tread width	10.8″	275 mm
Sidewall height	5.95″	151.3 mm
Wheel diameter	20″	508 mm
Circumference	100.25″	2546 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.

275/55R20 compared with other sizes

All 51 practical swaps involving 275/55R20 — diameter change, speedometer impact and a fit verdict for each.

305/50R20 → 275/55R20

305/50R20

Diameter +0.3% · This fits

265/55R20 → 275/55R20

265/55R20

Diameter −1.4% · This fits

285/55R20 → 275/55R20

285/55R20

Diameter +1.4% · This fits

265/60R20 → 275/55R20

265/60R20

Diameter +1.9% · This fits

275/60R20 → 275/55R20

275/60R20

Diameter +3.4% · Borderline. Check clearance first

285/50R20 → 275/55R20

285/50R20

Diameter −2.2% · This fits

255/55R20 → 275/55R20

255/55R20

Diameter −2.7% · This fits

275/50R21 → 275/55R20

275/50R21

Diameter −0.3% · This fits

305/55R20 → 275/55R20

305/55R20

Diameter +4.1% · Borderline. Check clearance first

275/65R18 → 275/55R20

275/65R18

Diameter +0.5% · This fits

265/50R20 → 275/55R20

265/50R20

Diameter −4.6% · Borderline. Check clearance first

285/60R20 → 275/55R20

285/60R20

Diameter +4.9% · Borderline. Check clearance first

255/70R18 → 275/55R20

255/70R18

Diameter +0.5% · This fits

285/45R22 → 275/55R20

285/45R22

Diameter +0.6% · This fits

275/55R20 → 255/70R18

255/70R18

Diameter −0.5% · This fits

275/55R20 → 275/65R18

275/65R18

Diameter −0.5% · This fits

275/55R20 → 255/55R20

255/55R20

Diameter +2.8% · This fits

275/55R20 → 265/50R20

265/50R20

Diameter +4.9% · Borderline. Check clearance first

275/55R20 → 265/55R20

265/55R20

Diameter +1.4% · This fits

275/55R20 → 265/60R20

265/60R20

Diameter −1.9% · This fits

275/55R20 → 275/60R20

275/60R20

Diameter −3.3% · Borderline. Check clearance first

275/55R20 → 285/50R20

285/50R20

Diameter +2.2% · This fits

275/55R20 → 285/55R20

285/55R20

Diameter −1.3% · This fits

275/55R20 → 285/60R20

285/60R20

Diameter −4.6% · Borderline. Check clearance first

275/55R20 → 305/50R20

305/50R20

Diameter −0.3% · This fits

275/55R20 → 305/55R20

305/55R20

Diameter −3.9% · Borderline. Check clearance first

275/55R20 → 275/50R21

275/50R21

Diameter +0.3% · This fits

275/55R20 → 275/40R22

275/40R22

Diameter +4.1% · Borderline. Check clearance first

275/55R20 → 275/50R22

275/50R22

Diameter −2.8% · This fits

275/55R20 → 285/40R22

285/40R22

Diameter +3.0% · Borderline. Check clearance first

275/55R20 → 285/45R22

285/45R22

Diameter −0.6% · This fits

275/55R20 → 285/50R22

285/50R22

Diameter −3.9% · Borderline. Check clearance first

275/55R20 → 305/45R22

305/45R22

Diameter −2.7% · This fits

245/35R20 → 275/55R20

245/35R20

Diameter −16.2% · Too big a jump

255/35R20 → 275/55R20

255/35R20

Diameter −15.3% · Too big a jump

255/45R20 → 275/55R20

255/45R20

Diameter −9.0% · Too big a jump

275/45R20 → 275/55R20

275/45R20

Diameter −6.8% · Too big a jump

295/35R20 → 275/55R20

295/35R20

Diameter −11.8% · Too big a jump

245/40R20 → 275/55R20

245/40R20

Diameter −13.1% · Too big a jump

245/45R20 → 275/55R20

245/45R20

Diameter −10.1% · Too big a jump

245/50R20 → 275/55R20

245/50R20

Diameter −7.1% · Too big a jump

255/50R20 → 275/55R20

255/50R20

Diameter −5.9% · Too big a jump

265/35R20 → 275/55R20

265/35R20

Diameter −14.4% · Too big a jump

265/45R20 → 275/55R20

265/45R20

Diameter −7.9% · Too big a jump

275/35R20 → 275/55R20

275/35R20

Diameter −13.6% · Too big a jump

275/40R20 → 275/55R20

275/40R20

Diameter −10.2% · Too big a jump

275/65R20 → 275/55R20

275/65R20

Diameter +6.8% · Too big a jump

285/65R20 → 275/55R20

285/65R20

Diameter +8.4% · Too big a jump

295/60R20 → 275/55R20

295/60R20

Diameter +6.4% · Too big a jump

295/65R20 → 275/55R20

295/65R20

Diameter +10.0% · Too big a jump

275/55R20 → 265/60R18

265/60R18

Diameter +4.6% · Borderline. Check clearance first

Common questions

What is 275/55R20 in inches?: A 275/55R20 tire is 31.91 inches tall and 10.8 inches wide, with a 5.95-inch sidewall, mounted on a 20-inch wheel. In metric that is 810 mm tall and 275 mm wide. The circumference is 100.25 inches.
How tall is a 275/55R20 tire?: 31.91 inches, or 810 mm. That is the overall diameter, wheel included. It turns about 632 times per mile, which is what your speedometer counts.
What do the numbers in 275/55R20 mean?: 275 is the tread width in millimeters, 55 is the aspect ratio — the sidewall height as a percentage of the tread width — and 20 is the wheel diameter in inches. So the sidewall is 275 × 55% = 151.3 mm tall.