tireheight.com

275/30R20 in inches

A 275/30R20 tire is 26.5″ tall and 10.8″ wide, and fits a 20″ wheel. In inches it is written 26.5×10.8R20.

Diameter26.50″
Width10.83″
Sidewall3.25″
275/30R20 drawn to scale: 26.50 inch diameter, 3.25 inch sidewall, 20 inch wheel, 10.83 inch tread width20″ wheel3.25″26.50″ overall10.83″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 275/30R20 tires really are

Heights published by Michelin and Toyo for all 12 tires in this size. Their published revolutions per mile work out to 25.7–25.8″ under load (below).

Real 275/30R20 tires measure 26.50–26.60″, against 26.50″ from the size code. They run both taller and shorter than the size code.

  1. Michelin Pilot Sport Cup 2 R26.60″ +0.10″
  2. Michelin Pilot Alpin PA426.54″ +0.04″
  3. Toyo Extensa HP II26.54″ +0.04″
  4. Toyo Proxes Sport26.54″ +0.04″
  5. Toyo Proxes Sport A/S26.54″ +0.04″
  6. Michelin Pilot Sport 326.50″ +0.00″
  7. Michelin Pilot Sport 4 S · 326.50″ +0.00″
  8. Michelin Pilot Sport All-Season 426.50″ +0.00″
  9. Michelin Pilot Super Sport26.50″ +0.00″
  10. Toyo Proxes Sport 226.50″ +0.00″
Each bar runs from the size code's 26.50″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.
Height under load25.7–25.8″

Published revs per mile (783–784) mean the tire rolls like a 25.7–25.8″ tire on the vehicle. Use this for speedometer calibration.

Weight spread26.2–30.1 lb

The lightest (Michelin Pilot Sport 4 S, XL) is 3.9 lb lighter per corner than the heaviest (Michelin Pilot Sport 4 S, XL).

12 tires in 275/30R20

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Sport 4 SPerformanceXL · 97(Y)26.5026.29.51,609784Spec page
Toyo Proxes Sport 2PerformanceXL · 97(Y)26.5026.29.21,609783Spec page
Michelin Pilot Sport 4 SPerformanceXL · 97(Y)26.5026.69.51,609784Spec page
Michelin Pilot Super SportPerformanceXL · 97Y26.5026.69.01,609784Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 97Y26.5026.910.01,609784Spec page
Toyo Extensa HP IIPerformanceXL · 97W26.5427.19.91,609783Spec page
Toyo Proxes SportPerformanceXL · 97(Y)26.5427.19.41,609783Spec page
Michelin Pilot Alpin PA4WinterXL · 97V26.5427.210.51,609784Spec page
Michelin Pilot Sport 3PerformanceXL · 97Y26.5027.99.01,609784Spec page
Michelin Pilot Sport Cup 2 RPerformanceXL · 97(Y)26.6028.05.01,609784Spec page
Toyo Proxes Sport A/SPerformanceXL · 97Y26.5428.19.61,609783Spec page
Michelin Pilot Sport 4 SPerformanceXL · 97(Y)26.5030.17.01,609784Spec page

Is 275/30R20 a 27-inch tire?

≈27″

Close. The size code works out to 26.50″, and the 12 tires here publish 26.50–26.60″, so people call it a 27.

All 27-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 275/30R20Difference
305/25R2026.00-0.49″-1.9%
255/30R2026.02-0.47″-1.8%
225/35R2026.20-0.30″-1.1%
265/30R2026.26-0.24″-0.9%
325/25R2026.40-0.10″-0.4%
235/35R2026.48-0.02″-0.1%
335/25R2026.59+0.10″+0.4%
285/30R2026.73+0.24″+0.9%
245/35R2026.75+0.26″+1.0%
295/30R2026.97+0.47″+1.8%

How to read 275/30R20

How to read any tire size

275/30R20 97Y as printed on the tire sidewall, with each part numbered275/30R20 97Y123456
How 275/30R20 97Y is printed on the sidewall. It's the most common code among the 12 tires here (6 of them); tires in this size come in other load and speed ratings too.
1275Section width

275 mm across the widest point, or 10.83 inches. Every 275 size

230Aspect ratio

A percentage, not a measurement: the sidewall is 30% as tall as the tire is wide, which is 82.5 mm or 3.25 inches.

3RConstruction

Radial construction.

420Wheel diameter

Mounts on a 20-inch wheel. Approved wheel widths run 9.0″ to 10.0″.

597Load index

Each tire carries up to 1,609 lb (730 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter26.50673 mm
Section width10.83275 mm
Sidewall height3.2582.5 mm
Circumference83.22,114 mm
Revolutions per mile (calculated, unloaded)761.2473 per km
Revolutions per mile (published by manufacturers)783–784486–487 per km
Approved wheel width9.0–10.0229–254 mm

Speedometer error after switching to 275/30R20

Your actual speed– mph

Questions about 275/30R20

What is 275/30R20 in inches?

26.50 inches tall, 10.83 inches wide, on a 20-inch wheel. Written in inches, that is roughly 26.5×10.8R20.

How much does a 275/30R20 tire weigh?

Between 26.2 lb and 30.1 lb for the 12 tires listed here. The lightest is the Michelin Pilot Sport 4 S (XL); the heaviest is the Michelin Pilot Sport 4 S (XL).

What wheel width do I need for 275/30R20?

Manufacturers approve 9.0–10.0″ wide wheels for this size.

How many revolutions per mile does a 275/30R20 make?

Published figures run 783–784 revolutions per mile. The calculated figure is 761.2, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 275/30R20 than 235/35R20?

0.02 inches taller on paper (26.50″ vs 26.48″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.